Maintenance costs for a fleet of tractors are expected to inflate at a rate of 8% per year. The first year's maintenance payment is due 1 year from now and will be $2,000. A fund is to be set up today to cover maintenance costs for 4 years in an account that will earn interest at a rate of 5%. How large must the fund be? a) Calculate the present worth in actual dollars by using the geometric series facto b) Check the result in (a) by first converting the $2,000 per year payments (expressed in constant dollars) into actual dollars and then calculating the present worth in actual dollars. c) Calculate the present worth in constant dollars. d) Take the actual dollar cash flow that you developed in (b) and apply the combined interest-inflation factor to calculate the present worth in constant dollars. Check your result with (c)