Mental Math & Quick Calculations · Interview Question
A store sells 1,200 items per day at an average price of $8.50. What is daily revenue?
How to answer
1,200 x $8.50. Break down: 1,200 x $8 = $9,600. 1,200 x $0.50 = $600. Total = $9,600 + $600 = $10,200 per day. Alternatively: 1,200 x $8.50 = 12 x $850 = $10,200. Annual revenue ≈ $10,200 x 365 ≈ $3.7M. In case interviews, always compute daily/weekly/annual conversions to contextualize the number. Is $3.7M reasonable for a retail store? Depends on type—a convenience store yes, a department store no.
Key idea: Break $8.50 into $8 + $0.50 and multiply each by 1,200.
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