Stuck on problem!

eBook Find the present values of these ordinary annuities. Discounting occurs once a year. Do not round intermediate calculations. Round your answers to the nearest cent. 3 a. $500 per year for 10 years at 4%. $ b. $250 per year for 5 years at 2%. $ C. $600 per year for 5 years at 0%. $ d. Rework previous parts assuming they are annuities due. Present value of $500 per year for 10 years at 4%:$ Present value of $250 per year for 5 years at 2%:$ Present value of $600 per year for 5 years at 0%:$