A series of four annual constant-dollar payments beginning with $15,000 at the end of the first year is growing at a rate of 8% per year. Assume that the base year is the current (n=0). If the market interest rate is 13% per year and general inflation rate (f') is 7% per year, find the present worth of this series of payments, based on a) constant-dollar analysis b) actual-dollar analysis Please show all work and don't use excel, thanks