16Hit1600
Advanced MathMediumValue after several years of percent decline

Advanced Math practice question

A population of 5,000 declines by 10% each year. What is the population after 3 years?

Answer: 3645

5,000 × 0.9³ = 5,000 × 0.729 = 3,645.

Common wrong answers

If you answered 3500
3,500 subtracts 10% of 5,000 three times (linear decline).
If you answered 4050
4,050 is the population after 2 years.
If you answered 3280.5
3,280.5 is the population after 4 years.

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