Compute the present values of the following annuities first assuming that payments are made on the last day of the period and then assuming payments are made on the first day of the period: (Do not round intermediate calculations. Round your answers to 2 decimal places. (e.g., 32.16)) 1) 7-year, annual payment of $678.09, and YTM = 13%; 2) 13-year, annual payment of $7968.26, and YTM = 6%; 3) 23-year, annual payment of $20,322.93, and YTM = 4%; 4) 4-year, annual payment of $69,712.54, and YTM = 31%.