An investment offers $4,350 per year for 15 years, with the first payment occurring one year from now. a. if the required return is 6 percent, what is the value of the investment? (do not round intermediate calculations and round your answer to 2 decimal places, e. g., 32.16.) b. what would the value be if the payments occurred for 40 years? (do not round intermediate calculations and round your answer to 2 decimal places, e. g., 32.16.) c. what would the value be if the payments occurred for 75 years? (do not round intermediate calculations and round your answer to 2 decimal places, e. g., 32.16.) d. what would the value be if the payments occurred forever? (do not round intermediate calculations and round your answer to 2 decimal places, e. g., 32.16.)