Find the present values of these ordinary annuities. Discounting occurs once a year. Do not round intermediate calculations. Round your answers to th nearest cent. a. $1,000 per year for 12 years at 10% $ b. $500 per year for 6 years at 5%. $ C. $1,000 per year for 6 years at 0% $ d. Rework previous parts assuming they are annuities due. Present value of $1,000 per year for 12 years at 10%: $ Present value of $500 per year for 6 years at 5%:$ Present value of $1,000 per year for 6 years at 0%: $