Question

The population of a town doubled every 5 years from 1960 to 1975. What is the percentage increase in population in this period ?

Answer 1

800%

Explanation:

Let p represent the population

in 1965 → the population becomes 2p

in 1970 → the population becomes 2(2p) = 4p

in 1975 → the population becomes 2(4p) = 8p

p ——————> 100%

8p ————-—-> x%

then

`x=(8p*100)/(p)=800`