This question evaluates the ability to model profit margins by combining revenue, variable costs from a mixed-product portfolio, and fixed costs using algebraic manipulation and basic cost-accounting concepts for a Data Scientist role.

You sell two burger products (classic and vegan) at the same price but with different unit costs. Year-2 fixed costs are known, and the sales mix between products is fixed. You want to find the total number of burgers to sell in Year 2 to achieve a target profit margin.
Let U be the total number of burgers sold (all products combined). Using the definition
margin = (revenue − variable cost − fixed cost) / revenue,
derive and solve for U such that the margin equals 34.43%.
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