To the closest year, how long will it take $200 to double if it is deposited and earns the fol-lowing rates? [Notes: (1) See the Hint for Problem XXXXXXXXXXThis problem cannot be solved exactly with...

To the closest year, how long will it take $200 to double if it is deposited and earns the fol-lowing rates? [Notes: (1) See the Hint for Problem 4-9. (2) This problem cannot be solved exactly with some financial calculators. For example, if you enter PV 5 2200, PMT 5 0, FV 5 400, and I 5 7 in an HP-12C and then press the N key, you will get 11 years for part a. The correct answer is 10.2448 years, which rounds to 10, but the calculator rounds up. However, the HP10BII gives the exact answer.] a. 7% b. 10% c. 18% d. 100%