K Question 10, P3-28 (similar to) Part 1 of 3 HW Score: 32.5%, 3.25 of 10 points O Points: 0 of 1 Save Double your money-Rule of 72. Approximately how long will it take to double your money if you get an annual return of 4.7%, 7.1%, or 9.1% on your investment? Approximately how long will it take to double your money if you get a 4.7% annual return on your investment? years (Round to two decimal places.) s