Find the present values of these ordinary annuities. Discounting occurs once a year. Do not round intermediate caiculations. Round your answers to the nearest cent. a. $800 per year for 16 years at 4%. b. $400 per year for 8 years at 2%. c. $600 per year for 8 years at 0%. s d. Rework previous parts assuming they are annuities due. Present value of $800 per year for 16 years at 4%:$ Present value of $400 per yeat for 8 years at 2%:$ Present value of $600 per year for 8 years at 0%:$