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Financial Analysis puzzles, solved step by step

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  1. 001Two store chains run identical stores and earn the same Rs 100 crore a year before property costs. One owns its stores; the other leases them at Rs 12 crore a year for 10 years. Once the lease is capitalised at 9%, the leaser's EBITDA rises by Rs 12 crore and a lease liability of about Rs 77 crore appears. How do you compare the two on EV/EBITDA fairly?Accounting flow riddlesHardMizuhoNew York · 2026

    Try it first

    The owner trades at 8.0x. The leaser's shares and debt are worth Rs 723 crore and its EBITDA, rent added back, is Rs 100 crore. Which multiple is the fair one to set beside 8.0x?

    Show the worked solution

    Put the lease liability inside EV whenever the rent is outside EBITDA. After capitalisation the leaser's EBITDA is Rs 100 crore, like the owner's. Its shares and debt are worth Rs 723 crore, so dividing those alone gives 7.2x and makes it look cheaper. Add the Rs 77 crore lease and it is 8.0x, the owner's multiple. The numerator and denominator must describe the same claims.

    Why does a lease behave like debt?

    Think of two families in identical flats. One bought with a home loan; the other rents on a ten year agreement it cannot walk away from. Both owe fixed payments for years. A long lease is a loan from the landlord, repaid in rent, so the rent contains both the use of the asset and the financing of it. Under IFRS 16, and Ind AS 116 in India, the leaser now shows that promise as a lease liabilityThe present value of the rent the company is contractually committed to pay over the lease term, carried on the balance sheet like a borrowing.: Rs 12 crore a year for ten years, discounted at 9%, is about Rs 77 crore.

    The relationship
    L=12×1−1.09−100.09=12×6.418≈77.0L = 12 \times \frac{1 - 1.09^{-10}}{0.09} = 12 \times 6.418 \approx 77.0
    12yearly rent, Rs crore
    0.09the discount rate applied to the lease
    10years left on the lease
    What it says in wordsThe lease liability is the rent stream discounted back to today, exactly as you would value a loan's repayments.

    What changes in the numbers, and what does not?

    Capitalisation moves the rent out of operating costs. It comes back as depreciation on a right-of-use asset and interest on the lease, both below EBITDA. So the leaser's EBITDA jumps by the full Rs 12 crore while nothing about its stores, customers or cash has changed. The same move puts about Rs 77 crore of lease on the balance sheet. The two changes are a pair, and a fair multiple has to use both halves or neither.

    Rent moves into EBITDA, so the lease must move into EVOwns its storesEnterprise value, Rs crore800 shares and debtEBITDA after lease capitalisation, Rs crore100800 / 100 = 8.0xNo lease, so nothing to adjustLeases its storesEnterprise value, Rs crore723 shares and debt+77 lease liabilityEBITDA after lease capitalisation, Rs crore88 after rent+12 rent added backMixed: 723 / 100 = 7.2xrent added to EBITDA, lease left out of EVConsistent: (723 + 77) / 100 = 8.0xrent in EBITDA and lease inside EV
    After capitalisation the leaser's EBITDA rises from Rs 88 crore to Rs 100 crore and a Rs 77 crore lease appears. Dividing only its Rs 723 crore of shares and debt by Rs 100 crore gives 7.2x, while adding the lease to EV gives 8.0x, the same as the owner.

    Where does this bite in real comparables work?

    Data providers and peer tables do not always treat leases the same way, and a peer set can mix companies reporting under different standards. Before trusting a multiple, check whether its EV includes lease liabilities and whether its EBITDA is before or after rent, then make every company in the table match. A retailer, airline or restaurant chain that leases most of its sites can look 11% cheaper than an owner purely from this mismatch, which is the whole of the gap in this example.

    Say the limitation too. The capitalised figure depends on the discount rate and the lease term the company chose, so two leasers with the same rent can carry different liabilities. Lease-adjusted multiples are better, not exact.

    Where candidates lose it

    The common loss is quoting the leaser at 7.2x and calling it cheap. The candidate has taken the EBITDA uplift from the new standard and forgotten the liability that came with it, so the comparison rewards a company for renting instead of owning.

    The second miss is going the other way and deducting rent from one company's EBITDA while leaving the other's untouched. Whichever basis you choose, say it once and apply it to every company in the set.

    What the interviewer asks next

    • Before lease capitalisation, how would you have compared the two chains, and what is EBITDAR?
    • What happens to the leaser's net income in year 1 compared with the old rent expense?
    • Does lease capitalisation change the leaser's free cash flow?
    • How should a DCF treat lease payments if EBITDA already excludes rent?

    Asked at Mizuho, Generalist, New York, 2026 (Wall Street Oasis): How does a $10 increase for depreciation Finance lease vs operating lease (which effect valuation)

  2. 002Company X trades at 12x earnings but 9x EV/EBITDA. Its peers trade at 15x earnings and 7x EV/EBITDA. Give two reasons, with numbers, that make both facts true at once.Valuation and multiples riddlesHardBarclaysNew York · 2026

    Try it first

    Which single fact could, on its own, push X's P/E down and its EV/EBITDA up at the same time?

    Show the worked solution

    X carries more debt and owns a stake in an associate. Debt of Rs 750 crore at 8% costs 5.6% after tax, less than the 6.7% its operations earn on their value, so levering lowers the P/E. The associate adds Rs 22 crore to net income but nothing to EBITDA, while its Rs 300 crore value sits inside EV. Strip it out and X is 7.0x, like its peers.

    Why can two multiples on the same company disagree?

    Picture a house with a mortgage. Its price compared with the rent it earns is one ratio; your equity in it compared with the rent left after the mortgage payment is another. The two only agree if there is no loan. EV/EBITDA looks at the whole business before financing, while P/E looks at the shareholders' slice after interest, tax and anything non-operating. Every gap between them is explained by something that sits between EBITDA and net income, or between EV and equity value.

    What numbers make both facts true?

    Give both companies the same operations: EBITDA Rs 150 crore, depreciation Rs 50 crore, operating profit Rs 100 crore, tax 30%. The peer has no debt, earns Rs 70 crore and is worth Rs 1,050 crore: 15.0x earnings and 7.0x EBITDA. X borrows Rs 750 crore at 8%, so interest of Rs 60 crore leaves Rs 28 crore from operations, and it books Rs 22 crore as its share of an associateA company in which the group holds a significant minority stake, usually 20% to 50%. The group books its share of that company profit below operating profit, never in revenue or EBITDA.'s profit. Net income of Rs 50 crore at 12x is equity of Rs 600 crore, and with the debt that is an EV of Rs 1,350 crore, 9.0x EBITDA.

    Same operations, different capital structure and one non-operating stakePeer: EBITDA 150Who funds the EV, Rs croreequity 1,050What the EV pays forcore operations 1,050Net income70P/E 1,050 / 70 = 15.0xEV/EBITDA 1,050 / 150 = 7.0xCompany X: EBITDA 150Who funds the EV, Rs croreequity 600debt 750What the EV pays forcore operations 1,050associate stake 300Net income2822after 60 of interestP/E 600 / 50 = 12.0xEV/EBITDA 1,350 / 150 = 9.0xCore only: 1,050 / 150 = 7.0x, same as the peer
    Company X's EV of Rs 1,350 crore is funded by Rs 600 crore of equity and Rs 750 crore of debt, and pays for the same Rs 1,050 crore of core operations as the peer plus a Rs 300 crore associate stake. Taking the stake out brings X back to 7.0x EBITDA.

    Which reason moves which multiple?

    Separate them, because the follow-up always asks. Debt lowers the P/E when its after-tax cost is below the earnings yield of the operations. Here debt costs 8% times 0.7, which is 5.6%, while the operations earn 70 on 1,050, or 6.7%. Swapping expensive equity for cheaper debt leaves the operating slice at about 10.7x earnings. The associate does the other job: its Rs 300 crore of value sits inside EV while its profit sits below EBITDA, which lifts EV/EBITDA from 7.0x to 9.0x.

    Name a third candidate if you have time: a lower tax rate than peers raises net income without touching EBITDA, so it also lowers P/E alone. Say what you would check to choose between them: the notes on debt, associates and the effective tax rate.

    Where candidates lose it

    Most candidates say X must have more debt and stop. Debt alone explains the lower P/E, but it does not raise EV/EBITDA if the business is worth the same, because EV is the same whoever funds it. The interviewer is waiting for something that sits inside EV but outside EBITDA.

    The other loss is giving reasons with no numbers. Build one small example in which both multiples land where the question says; it proves the reasons work together.

    What the interviewer asks next

    • Would you subtract the associate stake from X's EV in a comps table, and at what value?
    • If X's debt cost 11% instead of 8%, would its P/E still be below its peers'?
    • Which of the two multiples would you use to value X, and why?

    Asked at Barclays, Investment Banking, New York, 2026 (Wall Street Oasis): A company is trading at a lower P/E but a higher EV/EBITDA than peers

  3. 007You have a biased coin that lands heads one third of the time. How can you use it to produce a fair 50:50 result, and how many flips of the biased coin does each fair result take on average?Probability and expected valueHardDED.E. ShawNew York · 2026

    Try it first

    Flip in pairs, keep heads-tails and tails-heads, discard the rest. On average, how many single flips does one fair result take?

    Show the worked solution

    Flip twice: heads then tails counts as heads, tails then heads counts as tails, and anything else is thrown away and flipped again. The two mixed orders each have probability 2/9, so they are equally likely whatever the bias. A pair succeeds 4/9 of the time, so each fair result takes 9/4 pairs, or 4.5 flips. Knowing the bias is exactly 1/3 lets you cut that to 2.25.

    Why are heads-tails and tails-heads always equally likely?

    Picture two friends flipping the same lopsided coin, one after the other. The chance the first gets heads and the second tails is the heads chance times the tails chance. The chance of the reverse is the tails chance times the heads chance. Multiplication does not care about order, so the two mixed outcomes are exactly equally likely, whatever the bias. That symmetry is the whole trick, known as the von Neumann method. Here each mixed pair has probability 1/3 times 2/3, which is 2/9.

    Two flips in opposite order are equally likely, whatever the biasFlip twiceP(heads) = 1/3HH1/3 x 1/3 = 1/9Discard, flip againHT1/3 x 2/3 = 2/9Call it HEADSTH2/3 x 1/3 = 2/9Call it TAILSTT2/3 x 2/3 = 4/9Discard, flip againEach pair works2/9 + 2/9 = 4/9of the time, soyou need 9/4 pairs4.5flips perfair resultIf you know the bias is exactly 1/3: call TT (4/9) one side and HT or TH (4/9) the other.Only HH (1/9) is discarded, so a pair works 8/9 of the time: 2 x 9/8 = 2.25 flips per fair result.
    Flipping the biased coin twice gives heads-tails and tails-heads with probability 2/9 each, so calling one heads and the other tails is fair. Discarding the matching pairs means a pair works 4/9 of the time, which costs 4.5 flips per fair result on average.

    How do you get the average of 4.5 flips?

    Each pair either works or does not, independently of the last. Waiting for a success that happens with probability q takes 1/q tries on average, the same reason a die takes six rolls on average to show a six. A pair works with probability 4/9, so you need 9/4 pairs, and two flips a pair makes 4.5 flips. The method pays for its fairness with waste: 5 pairs in 9 are thrown away.

    The relationship
    E[flips]=2P(HT)+P(TH)=22p(1−p)=24/9=4.5E[\text{flips}] = \frac{2}{P(HT)+P(TH)} = \frac{2}{2p(1-p)} = \frac{2}{4/9} = 4.5
    pthe chance of heads on one flip, 1/3
    2p(1-p)the chance a pair is mixed, 4/9
    2flips used by each pair
    What it says in wordsDivide the flips per attempt by the chance an attempt succeeds.

    Can you do better if you know the bias exactly?

    Yes, and this is usually the follow-up. With p exactly 1/3, tails-tails has probability 4/9, the same as the two mixed pairs together. Call tails-tails one side and either mixed pair the other, and only heads-heads, 1/9 of pairs, is wasted, so each fair result costs 2 times 9/8, or 2.25 flips. The von Neumann method is still the better answer when nobody tells you the bias, because it works for any p. The limit for any scheme is set by how much randomness one flip carries: about 0.92 of a fair bit here, so no method can beat roughly 1.09 flips per fair result on average.

    Where candidates lose it

    The common loss is trying to build fairness from single flips, for example calling heads on one flip and tails on two in a row. Those schemes depend on the exact bias and usually fail the moment you write out the probabilities.

    The second loss is giving the method and not the cost. The interviewer reported here went straight on to efficiency, so have 4.5 flips ready, then say why the known-bias grouping halves it and why the order trick is still the safe answer.

    What the interviewer asks next

    • Your fair-result method uses 4.5 flips. How could you reuse the discarded heads-heads and tails-tails pairs to get more fair results from the same flips?
    • How would you simulate a fair six-sided die with this coin?
    • If the coin's bias is unknown and drifts slowly over time, does the pair method still work?

    Asked at D.E. Shaw, Research, New York, 2026 (Wall Street Oasis): How can I make an effective fair coin given a biased coin with p_heads = 1/3?

  4. 018What is the beta of a slot machine that pays back Rs 92 on average for every Rs 100 staked? And why does its expected return not match what the capital asset pricing model would give an asset with that beta?Cost of capital, leverage and ratesHardRothschild & CoNew York · 2021

    Try it first

    What is the slot machine's beta?

    Show the worked solution

    Its beta is zero, yet its expected return is minus 8%. Beta measures movement with the market, and a slot machine's payouts are random and unrelated to the market. CAPM would give a zero-beta asset the risk-free rate, say 7% a year, so the machine falls short by at least 15 points. There is no contradiction: CAPM prices assets bought as investments, and a slot machine is bought as entertainment.

    How can something so risky have a beta of zero?

    Think of an umbrella seller and an ice cream seller in the same town. Each has a volatile income, but whether it rains has nothing to do with the stock market. BetaHow much an asset tends to move when the market moves, measured as its covariance with the market divided by the variance of the market. measures how an asset moves with the market, not how much it moves, so a gamble driven by a random number generator has a beta of zero. The slot machine is about as volatile as anything in a town, but all of that risk is the kind a diversified owner can spread away, and in this case the casino does exactly that across thousands of players.

    No slope against the market, and still a loss on average-60%-30%+30%+60%0%-8%0%+8%fitted line: flat at -8%, beta = 0Player's return on stakesMarket return that monthExpected return0+7%-8%CAPM, beta 0:risk-free rate,a yearSlot machine:per stake,in secondsGap: at least 15 points
    Slot machine sessions plotted against the market's return show no slope, so the fitted beta is zero and the average session loses 8%. CAPM gives a zero-beta asset the risk-free rate, so the slot machine falls well short of what its beta alone would predict.

    Why does CAPM not give it the risk-free rate?

    CAPM says expected return equals the risk-free rate plus beta times the equity risk premium. With beta of zero that is just the risk-free rate, 7% a year in this example. The machine instead returns minus 8% on every stake, and a stake lasts seconds, so over a year of play the gap is far wider than the 15 points the two headline numbers suggest. In CAPM language that is a large negative alphaThe return an asset earns above or below what its beta implies under CAPM..

    The relationship
    E[r]=rf+β (E[rm]−rf)=7%+0×6%=7%slot:92−100100=−8%E[r] = r_f + \beta\,(E[r_m] - r_f) = 7\% + 0 \times 6\% = 7\% \qquad \text{slot}: \frac{92 - 100}{100} = -8\%
    r_frisk-free rate, 7% a year in this example
    βthe slot machine's beta, zero
    E[r_m] - r_fequity risk premium, 6%
    What it says in wordsCAPM gives a zero-beta asset the risk-free rate; the slot machine returns 92 for every 100 staked.

    So is CAPM wrong?

    No, it is answering a different question. CAPM describes the prices of assets that diversified investors hold to earn a return, where anyone could sell an overpriced asset short. Nobody plays a slot machine for return; players pay 8% of each stake for entertainment, the way a cinema ticket has a negative return. And you cannot short a single slot machine to collect the edge. The only way to take the other side is to own the casino, which needs licences, buildings and capital, and the casino's return on that capital is what an investor would compare with CAPM. Say that and the interviewer hears that you know where a model applies, not just its formula.

    Where candidates lose it

    The common loss is saying the beta is high because a slot machine is risky. That confuses total risk with market risk, which is the exact distinction CAPM is built on.

    The second loss is answering zero and then claiming the machine should earn the risk-free rate, or that CAPM is broken. Close with why the model does not apply: a consumption good with no way to short it is outside the model's world.

    What the interviewer asks next

    • What is the beta of the casino company's shares, and why is it not zero?
    • Can you think of an investment asset with a beta below zero? What return would CAPM give it?
    • What is your own personal beta, if your salary depends on the stock market?

    Asked at Rothschild & Co, Mergers and Acquisitions, New York, 2021 (Wall Street Oasis): what is the beta of a slot machine?

  5. 028The correlation between X and Y is 0.2 and the correlation between Y and Z is 0.5. What range of values can the correlation between X and Z take?Data and statistics intuitionHardTower Research CapitalNew York · 2019

    Try it first

    Pick the range before any algebra.

    Show the worked solution

    Anywhere from about -0.75 to 0.95. Read each correlation as the cosine of an angle between two arrows. X is 78.5 degrees from Y, and Z is 60 degrees from Y. Z can swing to the same side as X, leaving them 18.5 degrees apart, or to the other side, 138.5 degrees apart. The cosines of those angles are 0.9485 and -0.7485.

    Why can a correlation be drawn as an angle?

    Think of three people walking away from the same lamp post. Knowing how far apart the first two point, and how far apart the second and third point, limits how far apart the first and third can point, but only loosely. If you standardise each variable, its correlation with another is the cosine of the angle between them, so correlations must behave like angles in space. A correlation of 0.2 is an angle of 78.5 degrees; 0.5 is 60 degrees.

    Correlations are cosines of angles, so the third angle can only swing so farYXZ, same sideZ, other sideX to Y: 78.5 deg (cos 0.2). Y to Z: 60 deg (cos 0.5)Known: 0.2 and 0.5. X and Z can be anywhere in-1-0.500.51-0.750.95If both known were 0.9: X and Z must be-1-0.500.510.621.00Centre 0.2 x 0.5 = 0.10Half-width sqrt(0.96 x 0.75) = 0.849
    X sits 78.5 degrees from Y and Z sits 60 degrees from Y, so the angle between X and Z runs from 18.5 to 138.5 degrees, which puts their correlation anywhere from -0.75 to 0.95; two correlations of 0.9 would pin it much tighter, from 0.62 to 1.
    The relationship
    ρXZ∈ρXYρYZ±(1−ρXY2)(1−ρYZ2)=0.10±0.849\rho_{XZ} \in \rho_{XY}\rho_{YZ} \pm \sqrt{(1-\rho_{XY}^2)(1-\rho_{YZ}^2)} = 0.10 \pm 0.849
    rho XY, rho YZthe two known correlations, 0.2 and 0.5
    square roothow much room the weak links leave, the product of the two sines
    What it says in wordsThe range is centred on the product of the known correlations and is as wide as the product of how far each is from perfect.

    Where does the formula come from, and when does it bite?

    The three-by-three correlation matrix must not imply a negative variance for any mix of X, Y and Z, which means its determinant cannot go below zero. Solving that condition gives the formula above, the cosine rule for the difference and sum of two angles. The constraint is loose when the known correlations are weak and tight when they are strong. With 0.2 and 0.5, almost the whole scale stays open. With 0.9 and 0.9, X and Z must correlate at least 0.62: two things each closely tied to Y cannot drift far from each other. Say the practical use: a risk model that fills in missing correlations by hand can break this rule and produce a matrix that is not valid.

    Where candidates lose it

    The fast wrong answer is 0.10, the product, as if correlation passed along a chain. The product is the centre of the range, not the answer. The other wrong answer is that nothing can be said, which ignores that angles must fit together.

    Candidates who know the formula often cannot say why it holds. Draw the arrows, say cosine of an angle, and the formula follows in one line.

    What the interviewer asks next

    • If X and Y have correlation 0.9 and Y and Z 0.9, what is the minimum correlation of X and Z?
    • Can three variables all have pairwise correlation of -0.6?
    • Why might a hand-edited correlation matrix in a risk model fail to invert?

    Asked at Tower Research Capital, Prop Trading, New York, 2019 (Wall Street Oasis): What if the correlation between X and Y is 0.2 and the correlation between Y and Z is 0.5.

  6. 032A machine turns a Rs 10 note into a Rs 20 note, but each use takes exactly one year, costs Rs 2 of electricity, and the machine breaks after 10 uses. At a 10% interest rate, what would you pay for it today?Compounding and time valueHardGoldman SachsDallas · 2026

    Try it first

    Before you discount anything: what is the machine's real net gain per use, measured at the end of the year?

    Show the worked solution

    About Rs 43. Each use ties up a Rs 10 note for a year, which at 10% costs you Rs 11 by year end, plus Rs 2 of electricity, and pays Rs 20. That is Rs 7 a year for ten years, and Rs 7 times the ten-year annuity factor of 6.1446 is Rs 43.01. If the electricity is paid at the start of each year the net is Rs 6.80 and the value Rs 41.78.

    What is one use of the machine actually worth?

    Think of lending a friend Rs 10 for a year and getting Rs 20 back. You doubled your note, but you also went a year without it, and that year had a price: whatever the money would have earned in the bank. The machine does not create Rs 10 a year; it creates Rs 20 at year end in exchange for Rs 10 today, and Rs 10 today is worth Rs 11 at year end at 10%. Take off Rs 2 of electricity and each use leaves Rs 7, received one year after you feed it the note.

    Ten uses, Rs 7 net each, discounted back to todayOne use, valued at year end:+20 out - 10 x 1.1 note in - 2 power = 7Sum of ten present valuesRs 43.01 (power paid up front: 41.78)6.36Yr 15.79Yr 25.26Yr 34.78Yr 44.35Yr 53.95Yr 63.59Yr 73.27Yr 82.97Yr 92.70Yr 10Dashed outline: Rs 7 received at the end of each year. Filled: what it is worth today at 10%.Forget the Rs 1 a year the note could have earned and you get Rs 49.16, too much.
    Each of the ten uses leaves Rs 7 at the end of its year once the Rs 11 cost of the note and the Rs 2 of electricity are taken off the Rs 20, and the ten present values fall from Rs 6.36 to Rs 2.70 and sum to Rs 43.01.
    The relationship
    PV=(20−10(1.1)−2)×1−1.1−100.10=7×6.1446=43.01PV = \big(20 - 10(1.1) - 2\big)\times\frac{1-1.1^{-10}}{0.10} = 7 \times 6.1446 = 43.01
    10(1.1)the Rs 10 note's value at year end had you kept it at 10%
    6.1446the present value of Rs 1 a year for ten years at 10%
    What it says in wordsFind the net gain of one use at the end of its year, then value ten of them as an annuity.

    Why does the timing of the electricity change the answer?

    The question does not say when you pay for power. If you pay at the end of the year, the net is the Rs 7 above. If you pay at the start, alongside the note, the Rs 2 also costs you a year of interest, Rs 2.20 by year end, and the net drops to Rs 6.80, worth Rs 41.78. State the timing assumption out loud, because an interviewer who wrote this puzzle is listening for whether you notice that cash flows need a date. The other common answer, Rs 49.16, discounts Rs 8 a year and is wrong for a reason, not a rounding: it treats the Rs 10 note as free to borrow.

    One check makes the answer believable. You could reproduce the machine with a bank loan: borrow Rs 10 at 10%, run the machine, repay Rs 11 and the Rs 2 of power, keep Rs 7. A buyer will pay up to the present value of that stream, and no more, because the bank can supply the money at 10% anyway.

    Where candidates lose it

    The usual answer is Rs 49.16: Rs 8 a year, discounted. It misses that the note fed in each year is capital with a cost. Candidates who think of each use as a project, with an outflow today and an inflow in a year, do not make this mistake.

    The second loss is giving one number with no assumption. Say when you assume the electricity is paid, give both values if asked, and the interviewer hears someone who dates every cash flow.

    What the interviewer asks next

    • What would you pay if the machine could be used once a year forever?
    • At what interest rate is the machine worth nothing?
    • If the machine could run two notes at once, what would it be worth?

    Asked at Goldman Sachs, Summer Analyst Interview, Dallas, 2026 (Wall Street Oasis): A mad scientist invents a machine that turns a standard $10 bill into a $20 bill

  7. 034A parent earns Rs 200 crore on its own and owns 60% of a subsidiary that earns Rs 50 crore and has book equity of Rs 300 crore. What are consolidated net income, net income attributable to the parent, and the non-controlling interest on the balance sheet?Accounting flow riddlesHardMoelis & CompanyNew York · 2025

    Try it first

    Consolidated net income, before anything is split off: which figure?

    Show the worked solution

    Consolidated net income is Rs 250 crore, Rs 230 crore is attributable to the parent, and non-controlling interest on the balance sheet is Rs 120 crore. Control brings in all of the subsidiary's Rs 50 crore profit. The outside holders' 40%, Rs 20 crore, is shown as profit attributable to non-controlling interest. On the balance sheet, their 40% of Rs 300 crore of book equity sits as a separate line in equity.

    Why take in all of a company you only partly own?

    Think of a family that controls a shop it co-owns with a cousin. The family runs it, banks its takings and pays its bills, so to describe what the family controls you count the whole shop, then note that a share of the profit belongs to the cousin. Control, not ownership share, decides consolidation, so the parent adds 100% of the subsidiary's revenue, costs, assets and debt, then shows the minority's share of profit and equity on separate lines. That is why consolidated net income is 200 plus 50, Rs 250 crore, and not 200 plus 30.

    Consolidation takes in 100% of the subsidiary, then hands 40% back on its own lineParentOwn profit Rs 200 croreSubsidiaryProfit 50, book equity 300owns 60%Outside shareholders own 40%Consolidated net income, Rs croreParent 200+50250Less non-controlling interest: 40% x 50-20Attributable to parent shareholders230Equity section, Rs croreParent's 60%: 180NCI 120Subsidiary book equity 300NCI on the balance sheet40% x 300 = 120
    The parent consolidates all Rs 50 crore of the subsidiary's profit to reach Rs 250 crore, peels off the outside holders' Rs 20 crore to leave Rs 230 crore for its own shareholders, and shows their 40% of Rs 300 crore of book equity, Rs 120 crore, as non-controlling interest.

    Where does non-controlling interest show up on each statement?

    On the income statement, net income of Rs 250 crore is split into Rs 230 crore for the parent's shareholders and Rs 20 crore for non-controlling interest. EPS uses the Rs 230 crore. On the balance sheet, non-controlling interest of Rs 120 crore sits inside total equity, next to the parent's own equity; if the subsidiary keeps its Rs 50 crore profit for the year, the line grows by Rs 20 crore. On the cash flow statement nothing is deducted, because the minority share of profit is not a cash payment; only dividends paid to the outside holders leave as cash, in financing. Non-controlling interest is a claim on the group by other shareholders, which is why an EV bridge adds it back alongside debt.

    State your assumption: the minority is measured at its share of the subsidiary's book equity, with no fair-value uplift or goodwill allocated to it on acquisition. Under the full goodwill method the line would be larger. And note the boundary case: had the parent owned 40% without control, it would use the equity method, report the same Rs 230 crore of net income, but show none of the subsidiary's revenue or debt.

    Where candidates lose it

    The common error is consolidating 60% of the subsidiary, getting Rs 230 crore and calling it consolidated net income. That is proportionate consolidation, which is not how control is accounted for. The Rs 230 crore is right, but it is the attributable figure, not the consolidated one.

    The second loss is computing NCI on the balance sheet as 40% of the profit, Rs 20 crore. Profit is a flow; the balance sheet line is a stock, 40% of the subsidiary's equity.

    What the interviewer asks next

    • Why does an EV bridge add non-controlling interest, and what goes wrong if you forget it?
    • If the parent bought the remaining 40% for Rs 150 crore, how would the accounts change?
    • How would the numbers look under the equity method at 40% ownership?

    Asked at Moelis & Company, Generalist, New York, 2025 (Wall Street Oasis): Minority interest on the 3 statements and debt waterfall

  8. 037Estimate how many new narrow-body aircraft India's airlines will need each year over the next decade.Estimation and market sizingHardRothschild & CoParis · 2026Rothschild & CoParis · 2026

    Try it first

    Which split gives you the cleanest structure for this estimate?

    Show the worked solution

    About 106 a year, on stated assumptions. Assume 15 crore domestic trips a year. A 180-seat jet, 85% full, flying 5 sectors a day for 350 days carries about 2.68 lakh passengers, so the fleet is about 560 jets. At 8% traffic growth it needs 1,209 in ten years, 65 more a year, plus about 41 retirements a year on a 20-year life.

    How do you turn passengers into aircraft?

    Think of a school deciding how many buses to buy. It counts the children who need a seat, divides by how many one bus can carry in a day, then adds buses for next year's bigger intake and for the old ones being scrapped. Aircraft demand is the same: fleet size is passenger trips divided by what one jet carries in a year, and new orders are fleet growth plus replacement. State each number as an assumption, because the interviewer cares about the structure first and the inputs second.

    Start with traffic. Assume about 15 crore domestic passenger trips a year, and tell the interviewer you would check the current figure in the aviation regulator's monthly traffic data. A narrow-body has about 180 seats; assume 85% of them are filled, 5 sectors a day and 350 flying days. That is 267,750 passengers a jet a year, so today's fleet is about 560 jets.

    Split demand into growth and replacement, then size each from passengersNew narrow-bodies a yearabout 106Growth: fleet added(1,209 - 560) / 10 = 65Replacement: retirements812 avg fleet / 20 yrs = 41Fleet needed today15 crore / 2.68 lakh = 560Fleet in ten years560 x 1.08^10 = 1,209Passengers per jet a year180 x 85% x 5 x 350= 267,750: the assumption that moves the answer mostAverage fleet over the decadeRetire 1 jet in 20 each year(young fleets retire fewer)Left out: international short-haul,spare jets, groundings
    Fifteen crore trips at about 2.68 lakh passengers per jet need about 560 jets today and 1,209 in ten years at 8% growth, which adds 65 jets a year, and replacing jets on a 20-year life adds about 41 more, for roughly 106 new narrow-bodies a year.

    Which assumption moves the answer most, and what did you leave out?

    Growth carries more of the answer than replacement: at 8% a year the fleet more than doubles in ten years, adding 65 jets a year, while retirements on a 20-year life add 41. The number most worth defending is passengers per jet, because a sixth sector a day would cut the fleet by a sixth and every later number with it. Then name what you left out: international short-haul routes also fly narrow-bodies, airlines hold spare aircraft for maintenance, and engine problems can ground jets for months. Each pushes the true need above 106. Also say that orders and deliveries differ: airlines order years ahead, so order books can be far larger than a decade's need.

    Where candidates lose it

    Candidates jump to a number they half remember from a news story about a record order. That is not an estimate, and it is often an order book spread over many years, not annual demand. Build it from passengers and the interviewer can follow every step.

    The second loss is forgetting replacement entirely, or adding it as a fraction of today's fleet instead of the growing one. Average the fleet over the decade, or at least say that retirements grow with it.

    What the interviewer asks next

    • How does the answer change if load factors rise to 90%?
    • What share of the demand would one airline with a third of the market need?
    • How would you size wide-body demand differently?

    Asked at Rothschild & Co, Asset Management, Paris, 2026 (Wall Street Oasis): Can You estimate number of flights solds by airbus
    Asked at Rothschild & Co, Asset Management, Paris, 2026 (Wall Street Oasis): first part was more about market sizing and logic reasoning

  9. 043A company earns Rs 100 crore with 10 crore shares trading at Rs 200. It borrows Rs 400 crore at 9%, with a 25% tax rate, to buy back 2 crore shares. What happens to EPS, and at what P/E would the buyback break even?Cost of capital, leverage and ratesHardDeutsche BankSan Francisco · 2025

    Try it first

    Fewer shares, more interest. Which way does EPS move?

    Show the worked solution

    EPS falls from Rs 10.00 to Rs 9.125; the buyback breaks even at a P/E of 14.8x. After-tax interest is 400 x 9% x 75% = Rs 27 crore, so net income drops to Rs 73 crore over 8 crore shares. The shares cost 20x earnings, a 5% earnings yield, but the debt costs 6.75% after tax. EPS rises only if the P/E is below 1 / 0.0675 = 14.8x.

    What decides whether a buyback raises or lowers EPS?

    Think of borrowing at 9% to buy a shop that pays you 5% of its price in profit each year. Your income falls, even though you now own more. Buying your own shares is buying their earnings: it raises EPS only if the earnings yield on the shares, one over the P/E, beats the after-tax cost of the money used. At Rs 200 a share and EPS of Rs 10, the shares yield 5%. The debt costs 9% x (1 - 25%), which is 6.75%. You pay 6.75% to buy a 5% stream, so EPS falls.

    Buying at 20x earnings costs more than the 6.75% after-tax debt: EPS fallsRs 10.00BeforeRs 9.125After buyback73 / 8 = 9.125, down 8.75%10x15x20x25x89101112P/E paid for the sharesEPS after buyback, Rsold EPS 10breakeven 14.8x20x: Rs 9.125accretive
    Funding the buyback with 6.75% after-tax debt at 20x earnings cuts EPS from Rs 10.00 to Rs 9.125, and post-buyback EPS only beats the old Rs 10 when the shares are bought below 14.8x, the inverse of the after-tax cost of debt.
    The relationship
    EPS rises  ⟺  1P/E>rd(1−t)  ⟺  P/E<10.09×0.75=14.8×\text{EPS rises} \iff \frac{1}{\text{P/E}} > r_d(1-t) \iff \text{P/E} < \frac{1}{0.09 \times 0.75} = 14.8\times
    1/(P/E)the earnings yield on the shares bought back
    r_d(1-t)the after-tax cost of the debt used to buy them
    What it says in wordsA debt-funded buyback raises EPS only when the earnings yield on the shares beats the after-tax interest rate.

    Does a lower EPS mean the buyback destroys value?

    Not by itself. EPS is an accounting test, and it ignores what happens to risk. Replacing equity with debt raises the risk borne by every remaining share, so a fall in EPS can sit alongside an unchanged or higher share price if the debt tax shield is worth more than the extra risk. Equally, a rise in EPS at a low P/E is not proof of value created. Say both sides: the EPS answer is Rs 9.125, the breakeven is 14.8x, and the value question turns on whether the shares were bought below what they are worth and on what the extra leverage does to the cost of equity.

    Where candidates lose it

    The fast wrong answer is that EPS rises because there are fewer shares: Rs 100 crore over 8 crore shares, Rs 12.50. That forgets the interest on the borrowing, which is the whole point of the question.

    The second loss is forgetting tax. Interest is tax deductible, so the cost that matters is 6.75%, not 9%. Using the pre-tax rate gives a breakeven P/E of 11.1x and the wrong threshold.

    What the interviewer asks next

    • What if the buyback were funded with cash earning 4% before tax?
    • At what share price would the buyback be exactly EPS-neutral?
    • Why might a board do a dilutive buyback anyway?

    Asked at Deutsche Bank, Investment Banking, San Francisco, 2025 (Wall Street Oasis): What happens to EPS if a company issues debt to buyback shares

  10. 051You may roll a fair die up to three times. After each roll you either stop and take the face value in rupees, or roll again; if you reach the third roll you must keep it. What is your strategy, and what is the game worth?Probability and expected valueHardRCRBC Capital MarketsToronto · 2025

    Try it first

    Before you work it: what is the game worth if you play it well?

    Show the worked solution

    Stop on a 5 or 6 after the first roll, on 4 or more after the second, and take whatever the third gives. The game is worth 14/3, about 4.67. Solve it from the end: a last roll is worth 3.5, so with two rolls left you keep anything above 3.5, which makes two rolls worth 4.25. With three rolls left you keep only what beats 4.25.

    Why do you start from the last roll?

    Think of house hunting with three viewings booked and a rule that you must take the last flat if you get that far. You cannot judge the first flat until you know what walking away from it is worth, and that depends on the viewings still to come. A stop or continue decision is only as good as your value for continuing, so you price the last stage first and carry that value backwards. The method is called backward inductionSolving a sequence of decisions from the final step back to the first, so each earlier choice is made knowing what the later ones are worth., and it is how an option to wait is valued in finance too.

    On the third roll there is no choice: you get the face, and a fair die averages (1 + 2 + 3 + 4 + 5 + 6) / 6 = 3.5. That 3.5 is the price of walking away from the second roll. So on the second roll you keep a 4, 5 or 6, each of which beats 3.5, and re-roll a 1, 2 or 3. Half the time you keep an average of 5; half the time you collect 3.5. Two rolls are worth 0.5 x 5 + 0.5 x 3.5 = 4.25.

    Solve from the last roll backwards: each value becomes the bar to beatRoll 1: three rolls in handWalk-away value 4.25123456Keep 5 or 6Worth with this many rolls4.67Roll 2: two rolls in handWalk-away value 3.50123456Keep 4, 5 or 6Worth with this many rolls4.25Roll 3: the last rollNo choice left123456Keep anythingWorth with this many rolls3.503.50 sets roll 2's bar4.25 sets roll 1's barOrder of solving: last roll first, then carry the value back
    The last roll is worth 3.5, which makes 4, 5 and 6 worth keeping on the second roll and gives two rolls a value of 4.25; that 4.25 then makes only 5 and 6 worth keeping on the first roll, and the game is worth 4.67.

    What changes when you hold three rolls?

    The bar goes up. With three rolls in hand, walking away from the first roll is worth 4.25, so a 4 is no longer good enough: only a 5 or a 6 beats it. Two faces in six you keep, averaging 5.5; four faces in six you roll on and collect 4.25. That is (2/6) x 5.5 + (4/6) x 4.25 = 1.83 + 2.83 = 4.67.

    The relationship
    V1=3.5,V2=36⋅5+36⋅V1=4.25,V3=26⋅5.5+46⋅V2≈4.67V_1 = 3.5,\quad V_2 = \tfrac{3}{6}\cdot 5 + \tfrac{3}{6}\cdot V_1 = 4.25,\quad V_3 = \tfrac{2}{6}\cdot 5.5 + \tfrac{4}{6}\cdot V_2 \approx 4.67
    V_nthe value of the game with n rolls still available
    5the average of the faces kept on the second roll: 4, 5 and 6
    5.5the average of the faces kept on the first roll: 5 and 6
    What it says in wordsEach stage is worth the chance of keeping times the average kept, plus the chance of rolling on times the value of the stage after it.

    What do you add to show you see the pattern?

    Two observations. First, the bar rises with the number of chances left. A candidate who applies one rule, keep 4 or more, on every roll gets 4.625 instead of 4.667: a small loss that shows the continuation value was never priced. Second, each extra roll is worth less than the one before: the second roll adds 0.75, the third only 0.42, and a fourth would add 0.28. An extra option is worth less when the options you already hold are good. The limit to say out loud: this strategy maximises the average, which is right for a player who plays many times; someone playing once who needs at least 4 would play differently.

    Where candidates lose it

    The usual loss is using 3.5 as the bar on every roll. It is right for the second roll and wrong for the first, where the bar is 4.25 because two rolls still remain. Keeping a 4 on the first roll gives up only about 0.04 in value, but it tells the interviewer you never priced the right to continue.

    The other loss is solving forwards, listing every path from the first roll. That tree has dozens of branches and eats the clock. Say that you will start from the last roll, and the problem shrinks to three lines.

    What the interviewer asks next

    • With four rolls allowed, what is the game worth and what is the first-roll bar?
    • Each re-roll now costs 0.25. Does the strategy change?
    • How does this connect to the early exercise decision on an American option?

    Asked at RBC Capital Markets, Quantitative Trading, Toronto, 2025 (Wall Street Oasis): Best way to maximize EV across 3 chosen dice rolls (can choose to continue or not).

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