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. $500 per year for 12 years at 12%. $ b. $250 per year for 6 years at 6%. c. $900 per year for 6 years at 0%. $ d. Rework parts a, b, and c assuming they are annuities due. Future value of $500 per year for 12 years at 12%: $ Future value of $250 per year for 6 years at 6%: $ Future value of $900 per year for 6 years at 0%: $