Question

if the population of a country increases at a rate of 1.5% annually, and it's current population is 430,000, how many years will it take for the population to triple?

Answer 1

3 * 430,000 = 430000 * 1.015^t

1.015^t =   3
t ln 1.015 = ln 3
t  = ln 3 / ln1.015  =   74 years 

Answer 2

73 is the correct answer