3M Roofing is considering the purchase of a crane that would cost $52,051, would have a useful life of 5 years, and would have so salvage result in labor savings of $17,000 per year. The internal rate of return on the investment in the crane is closest to: 18% 20% 19% 17% (Ignore income taxes in this problem.) Wanna be a Cowboy Corporation is contemplating purchasing equipment that would increase sales revenues be cash operating expenses by $117,000 per year. The equipment would cost $690,000 and have a 6 year life with no salvage value. The annual depreciation