Waukee Railroad is considering the purchase of a powerful, high-speed wheel grinder to replace a standard wheel grinder that is now in use. Selected information on the two machines is given below: Standard wheel High-speed wheel grinder grinder Original cost new 21,000 32,000 Accumulated depreciation to date 6,400 - Current salvage value 9,400 - Estimated cost per year to operate 15,000 7,400 Remaining years of useful life 5 years 5 years Required: Prepare a computation covering the five-year period that will