How would you calculate a profit-margin total when products have very different sales volumes?
Instruction: Use figures you can calculate aloud. Define profit consistently, including discounts or costs when they belong in the business metric.
Context: Combines correct aggregation with explicit zero-denominator semantics and a numerical case that exposes an average-of-percentages error.
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I'd calculate total profit divided by total revenue, rather than add or average the product percentages. Suppose one product has 100 in revenue and 50 in profit, while another has 900 in revenue and 90 in profit...
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