Problem 5-7 Calculating the Number of Periods [LO4] At 6.8 percent interest, how long does it take to double your money? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) Length of time 10.54 years At 6.8 percent interest, how long does it take to quadruple it? (Do not round intermediate calculations and round your answer to 2 decimal places, e.9,, 32.16.,) Length of time years This one