Solve for the unknown number of years in each of the following (Enter rounded answers as directed, but do not use the rounded numbers in intermediate calculations. Round your answers to 2 decimal places (e.g., 32.16)):
Present Value Years Interest Rate Future Value
$ 1,100 11 % $ 1,955
2,791 9 4,550
34,505 14 395,620
34,200 21 223,916