Major overhaul expenses of $5,000 each are anticipated for a large piece of earthmoving equipment. The expenses will occur at EOY four and will continue every three years thereafter up to and including year 13. The interest rate is 12% per year. a) Draw a cash-flow diagram. b) What is the present equivalent of the overhaul expenses at time 0 ? c) What is the annual equivalent expense during only years 5-13