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Capital One·Data Scientist·Technical Phone Screen·Intermediate

Intermediate
May 2026

Summary

A Capital One Data Scientist interview that was essentially a finance math problem dressed up as a case question. One question, pretty self-contained, but easy to fumble if you rush the arithmetic.

Questions Asked (1)

Q1

Given fixed costs of $375M, sales of 231M units at $4 each with a $1 unit cost, calculate the Year 1 profit margin (profit divided by revenue) as a percentage to two decimal places, walking through each step.

Product Analytics & MetricsPricing & Monetization
Author's notes

The math itself isn't hard but I almost tripped up by forgetting to subtract fixed costs before dividing.

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AI HintsAI Generated

Suggested Approach

Break the problem into revenue, variable costs, contribution margin, and fixed costs to compute profit, then divide by revenue for the margin. Walk through each calculation step-by-step, stating units and dollar amounts clearly, and round the final percentage to two decimal places.

Pro tip: After computing the margin, briefly interpret what it means for the business—e.g., whether it's healthy for the industry or what levers could improve it—to show you think beyond the math.

1. Calculate Total Revenue

Multiply units sold (231M) by price per unit ($4) to get total revenue in dollars.

2. Calculate Total Variable Costs

Multiply units sold (231M) by variable cost per unit ($1) to get total variable costs.

3. Compute Contribution Margin

Subtract total variable costs from total revenue to find the contribution margin available to cover fixed costs.

4. Determine Profit

Subtract fixed costs ($375M) from the contribution margin to get the Year 1 profit (or loss).

5. Calculate Profit Margin

Divide profit by total revenue and multiply by 100 to express as a percentage, rounding to two decimal places.

Key Points to Mention

  • Revenue = Units × Price
  • Variable Cost = Units × Unit Cost
  • Contribution Margin = Revenue − Variable Costs
  • Profit = Contribution Margin − Fixed Costs
  • Profit Margin = (Profit / Revenue) × 100
  • Interpretation: A negative margin indicates a loss, which may be expected in Year 1 due to high fixed costs.

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.