Please work out how to solved these!

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 16%. $ b. $450 per year for 6 years at 8%. $ C. $600 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 16%: $ Future value of $450 per year for 6 years at 8%: $ Future value of $600 per year for 6 years at 0%:$ Find the present values of these ordinary annuities. Discounting occurs once a year. Do not round intermediate calculations. Round your answers to the nearest cent. a. $1,000 per year for 12 years at 6%. $ b. $500 per year for 6 years at 3%. $ c. $700 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 6%: $ Present value of $500 per year for 6 years at 3%: $ Present value of $700 per year for 6 years at 0%: $