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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. $1,000 per year for 16 years at 6%. b. $500 per year for 8 years at 3%. c. $800 per year for 4 years at 0%. $ d. Rework previous parts assuming they are annuities due. Present value of $1,000 per year for 16 years at 6%:$ Present value of $500 per year for 8 years at 3%: $ Present value of $800 per year for 4 years at 0%: $