Find the future values of these ordinary annuities. Compounding occurs once a year. Do not round intermediate calculations. Round your answers to the nearest cent. a. $900 per year for 12 years at 6%. $ b. $450 per year for 6 years at 3%. $ c. $800 per year for 6 years at 0%. $ d. Rework parts a, b, and c assuming they are annuities due. Future value of $900 per year for 12 years at 6%:$ Future value of $450 per year for 6 years at 3% : $ Future value of $800 per year for 6 years at 0% : $