You have inherited $25,000. You plan to invest the inheritance in a portfolio of stocks and bonds yielded 9%. Your goal is to have this investment fund your retirement, which you estimate will require $3,200,000.Using the Rule of 72, how long will it take to reach your investment goal?

a) approx. 32 years

b) approx. 45 years

c) approx. 40 years

d) approx. 56 years

e) approx. 65 years