Solve for the unknown number of years in each of the following (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.):

Solve for the unknown number of years in each of the following (Do not round intermediate calculations and round your answers to 2 decimal places, e.g.,32.16.): Interest Future Value Present Value $ 490 740 17,700 20,800 Years Rate 10% $ 1,252 1,670 216,050 262,330 16 13