Question

a town has an initial population of 500 that increases by 15% in 10 years . what will be the population in 30 years

Answer 1

If it increases by 15% every 10 years that means for every 10 years, the population increases by a factor of 1.15

So, in ten years the population is
575

In twenty years it is
661

In 30 years it is
760