A Population Growing at an Annual Rate R Will Triple

A population growing at an annual rate r will triple in a time t given by the formula . If the growth rate remains constant and equals 9% per year, how long will it take the population of the town to triple?

A) 2.2 years
B) 12.2 years
C) 5.3 years
D) 6.6 years
E) 1 years