(Ignore income taxes in this problem.) Henry's Roofing is considering the purchase of a crane that would cost $104,972, would have a useful life of 7 years, and would have no salvage value. The use of the crane would result in labor savings of $23,000 per year. The internal rate of return on the investment in the crane is closest to: a. 13% b. 14% C. 12% d. 10%