Compare two excavators whose cash flows are given below. The rate of interest is 10%. Which excavator is more desirable? a) Use the Study Period Method: i) Over 3 years. ii) Over 3 years, using the "implied salvage value" in the longer lived alternative. iii) Over 5 years, if the second excavator will continue to bring in $40,000 per year for another two years provided that a major overhaul is made at the end of the third year, estimated at $66,000.