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. $900 per year for 16 years at 6%. $ b. $450 per year for 8 years at 3%. $ c. $700 per year for 8 years at 0%. $ d. Rework previous parts assuming they are annuities due. Present value of $900 per year for 16 years at 6%: $ Present value of $450 per year for 8 years at 3%: $ Present value of $700 per year for 8 years at 0%: $