If the population doubled in size over 19 months and the current population is 20,000, what will the population be 5 years from now?

Question

The population of a southern city follows the exponential law

Answer 1

2 = e^r(19/12)

ln2 = r(19/12)

r = (12ln2)/t19

P = 20,000e^(12ln2)5/19

=20,000e^(60/19)ln2= 20,000(9.034) = 180,685 people after 5 years

it double about 3.15 times

1 time: 40,000

2 times: 80,000

3 times 160,000

3.15 times maybe 180,000