You want to find n such that

(1.32)^n = 5

Such an equation is solved using logarithms

n = log(5)/log(1.32)

n ≈ 5.797

It will take

(1.32)^n = 5

Such an equation is solved using logarithms

**.****n*log(1.32) = log(5)**n = log(5)/log(1.32)

n ≈ 5.797

It will take

**nearly 6 years**for the population to grow to 5 times its current value.