Calculate the future value of the following annuity streams: a. $6,000 received each year for four years on the last day of each year if your investments pay 6 percent compounded annually. b. $6,000 received each quarter for four years on the last day of each quarter if your investments pay 6 percent compounded quarterly. c. $6,000 received each year for four years on the first day of each year if your investments pay 6 percent compounded annually. d. $6,000 received each quarter for four years on the first day of each quarter if your investments pay 6 percent compounded quarterly. (For all requirements, do not round intermediate calculations. Round your answers to 2 decimal places. (e.g., 32.16))