PRC-2 · Chapter 3 · Question 10 of 45
A manufacturer sells 1000 units in January, but sales decrease by half each month thereafter. Which formula calculates the total sales for the first 5 months?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: A) S = 1000(1 - 0.5^5) / (1 - 0.5)
Explanation
Because the sales halve each month, this represents a geometric progression with a = 1000 and r = 0.5. The appropriate sum formula is S = a(1 - r^n) / (1 - r).
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