PRESENT VALUE OF AN ANNUITY Find the present values of these ordinary annuities. Discounting occurs once a year. Round your answers to the nearest cent a. $900 per year for 12 years at 16%. b. $450 per year for 6 years at 8%. c. $1,000 per year for 10 years at 0%. Rework previous parts assuming that they are annuties due. Round your answers to the nearest cent. d, $900 per year for 12 years at 16%. e, $450 per year for 6 years at 8%. f, $1,000 per year for 10 years at 0%