Your father is now planning to retire, and his employer has promised him a guaranteed, but fixed, income of $50,000 per year for the rest of his life. If the rate of inflation is 5% per year, how much in current dollars will the payment at the end of 20th year be worth? a. $20,293.43 b. $19,798.47 c. $18,844.47 d. $19,315.58 e. $20,800.77

I know the answer is C. but how would i use a financial calculator to figure this out?