Compute required output to recover 10% investment

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Quick Overview

This question evaluates a candidate's ability to perform cost-volume-profit analysis and quantitative financial modeling, assessing skills in algebraic formulation of profit equations, capacity constraint evaluation, and derivation of generalized feasibility formulas.

Compute required output to recover 10% investment

Company: Capital One

Role: Data Scientist

Category: Statistics & Math

Difficulty: medium

Interview Round: Technical Screen

Energy One operates a fossil-fuel plant with these economics: maximum output 8.8 million MWh/year; electricity sale price = $40/MWh; variable cost = $20/MWh; lease cost = $5 million/month; other fixed costs = $25 million/year; initial investment = $400 million. 1) How many MWh of production (X) are required for annual profit to cover 10% of the initial investment (i.e., $40 million), assuming the plant can sell all generated electricity at the stated price? Show the profit equation and solve for X. 2) Verify whether the required X is feasible given the annual maximum output constraint; if not, explain the shortfall and the breakeven that is achievable. 3) Generalize a formula for the required output to cover a target return R (in $) given price p, variable cost v, monthly lease L, annual fixed cost F, and capacity limit K. State any feasibility conditions clearly.

Overview: This question evaluates a candidate's ability to perform cost-volume-profit analysis and quantitative financial modeling, assessing skills in algebraic formulation of profit equations, capacity constraint evaluation, and derivation of generalized feasibility formulas.

Read the full Capital One Data Scientist interview experience this question came from

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Oct 13, 2025
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Power Plant Profit Target and Capacity Feasibility

Context

You are evaluating a fossil-fuel power plant. The plant can sell all electricity it generates at the stated price. Annual economics:

  • Maximum output: 8.8 million MWh/year
  • Price: $40/MWh
  • Variable cost: $20/MWh
  • Lease: $5 million/month
  • Other fixed cost: $25 million/year
  • Initial investment (sunk for this analysis): $400 million

Tasks

  1. Required output X (in MWh) for annual profit to equal 10% of the initial investment (i.e., $40 million). Write the annual profit equation and solve for X.
  2. Check whether the required X is feasible given the 8.8 million MWh/year capacity. If infeasible, quantify the shortfall and state the maximum breakeven/profit achievable under the capacity constraint.
  3. Generalize a formula for required output to cover a target annual return R (in $) given:
    • price p ( /MWh),variablecostv(/MWh), variable cost v ( /MWh), monthly lease L ( /month),annualfixedcostF(/month), annual fixed cost F ( /year), and capacity limit K (MWh/year). State feasibility conditions clearly.
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