Use the Rule of 72 to estimate the investments doubling time and then determine the actual doubling time. Principal (P) ($) Compound Interest Rate per Annum (%) Compounding Frequency Term 80 000 7.2 quarterly 15 years

A. 10 years; 10.2 years

B. 10 years; 9.63 years

C. 10 years; 9.97 years

D. 10 years; 9.71 years