The population of a country doubled every 10 years from 1950 to 1980. What was the percent increase in population during this time?
Answer: 700%
Explanation
Let the initial population in 1950 be 100.
Since the population doubles every 10 years, the population growth is as follows:
- 1960 → 100 × 2 = 200
- 1970 → 200 × 2 = 400
- 1980 → 400 × 2 = 800
Total increase in population = 800 - 100 = 700
Percentage increase = (700 / 100) × 100 = 700%.
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