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 10%. $ b. $250 per year for 5 years at 5%. $ c. $1,000 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 10% : $ Present value of $250 per year for 5 years at 5% : $ Present value of $1,000 per year for 5 years at 0% : $