Can an expert help verify my answers please

Using the tables in Exhiblts 263 and 264, determine the present value of the following cash flows, discounted at an annual rate of 15 percent: Note: Round "PV factors" to 3 decimal places. Do not round intermediate calculations and round your final answers to the nearest whole dollar amount. Required: a. $60.000 to be recelved 20 years from today b. $32,000 to be received annually for 10 years. c. $28,000 to be received annually for five years, with an additional $18,000 salvage value expected at the end of the fifth year. d. $50,000 to be recelved annually for the first three years, followed by $40,000 recelved annually for the next two years (total of five years in which cash is recelved)