Find the present values of these ordinary annuities. Discounting occurs once a year. Round your answers to the nearest cent. a. $400 per year for 10 years at 12%. b, $200 per year for 5 years at 6%. C. $1,000 per year for 6 years at 0%. Rework previous parts assuming that they are annuities due. Round your answers to the nearest cent. d. $400 per year for 10 years at 12%. e, $200 per year for 5 years at 6%. f, $1,000 per year for 6 years at 0%