Question

Denise put $95 into an account that pays 5.2% interest, compounded monthly. According to the rule of 72, approximately how long will it take for her money to double?

Answer 1

T=72÷5.2=13.8 or 14 years

Answer 2

13.8 years. 
72/(.052X100)=13.8

72/ interest rate x 100