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. a. $500 per year for 10 years at 4%. b. $250 per year for 5 years at 2%. c. $800 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 $800 per year for 5 years at 0%:$