At 55 percent interest how long does it take to double your

Question

At 5.5 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                   years

At 5.5 percent interest, how long does it take to quadruple it? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)

Length of time                    years