Calculate the present value of the following annuity streams: a. $4,000 received each year for six years on the last day of each year if your investments pay 5 percent compounded annually. b. $4,000 received each quarter for six years on the last day of each quarter if your investments pay 5 percent compounded quarterly. c. $4,000 received each year for six years on the first day of each year if your investments pay 5 percent compounded annually. d. $4,000 received each quarter for six years on the first day of each quarter if your investments pay 5 percent compounded quarterly.