A Population Growing at an Annual Rate R Will Triple $t = \frac { \ln 3 } { r }$

Multiple Choice

A population growing at an annual rate r will triple in a time t given by the formula $t = \frac { \ln 3 } { r }$ .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) 5.3 years
C) 6.6 years
D) 1 years
E) 12.2 years