If the size of a bacteria colony doubles in 6 hours, how long will it take for the number of bacteria to triple? Give your answer in exact form and decimal form.

Exact:

Decimal (nearest hundreth):

ok so i know the equation that i have to use, i believe its,

2=(1+r/100)^t

and then for the tripleing time you just find, r, and plug it in...can someone let me know if im on the right track..thanks

mathlete