A towns population is currently 500. If the population doubles every 30 years, what will the populat

A towns population is currently 500. If the population doubles every 30 years, what will the population be 120 years from now?

Find the number of doubling times:
120 years / 30 years per doubling = 4 doubling times

Set up our growth function P(n) where n is the number of doubling times:
P(n) = 500 * 2^n

Since we have 4 doubling times, we want P(4):
P(4) = 500 * 2^4
P(4) = 500 * 16
P(4) = 8,000