A town had residents. Its population falls by each year. About how many residents does it have after years?
Answer and explanation
Correct answer: C.
- Step 1: A annual decrease means the population retains of its value each year.
- Step 2: Compute the compound retention factor over years: .
- Step 3: Multiply by the initial population: .
Answer
.
Why not the others: Subtracting linearly () ignores compounding.
Practise more Percentages and percent change.
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