Multiple choice general knowledge math & puzzles

The population of a country doubled every 10 years from 1960 to 1990. What was the percent increase in population during this time?

  1. 700

  2. 600

  3. 500

  4. 400
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If population doubles every 10 years from 1960 to 1990, that's 30 years = 3 periods. Starting from P, after 3 periods: P × 2^3 = 8P. Percent increase = ((8P - P)/P) × 100 = 700%.

Keep practicing — related questions