The population of a city was 60,000 in the year 2005 and increased by 2.5% every year.

Question

a) Write a formula for the population size depending on time
b) What was the population in 2015?
c) In what year will the population double?

Answer 1

a) p = 60000 * (1 + .025)^t ... t in years

b) plug in 10 for t ... solve for p

c) plug in 120000 for p ... solve for t