need an explanation of how to solve it with a financial calculator

Solve for the unknown interest rate in each of the following: (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 132.16) Present Value Years Interest Rate Future Value 181 8 % 317 1,080 335 13 % 11 % 185,382 48,000 40,353 25 % 531,618 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.) Years Interest Rate 7% Present Value $ 610 940 26,350 43,500 8 % Future Value $ 1,389 1,821 289,715 430,258 9% 11%