Find the present values of these ordinary aninuides. Discounting occurs once a year. Do not round intermediate calculations. Round your answers to the nearest cent. a. $500 per year for 16 years at 12%. $ b. $250 per year for 8 vears at 6%. 5 C. $300 per year for 8 years at 0% 5 d. Rework previous parts assuming they are annuities due. Present value of $500 per year for 16 years at 12%:5 Present value of $250 per vear for 8 years at 646: s Present value of 300 per year for 8 years at 0% is