a. If the interest rate is 4.0% per year, approximately how long will it take for your money to quadruple in value? (Use the Rule of 72. Round your answer to 2 decimal places.) Answer is complete and correct. Number of years 36.00 b. If the inflation rate is 3.0% per year, what will be the change in the purchasing power of your money over this period? (Use the Rule of 72 to compute the number of years. Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) & Answer is complete but not entirely correct. Purchasing power increases by 2 9.62 %