(Ignore income taxes in this problem.) Johnson, Inc., is considering the purchase of a tractor-trailer that would cost $178,848, would have a useful life of 8 years, and would have no salvage value. The tractor- trailer would be used in the company's hauling business, resulting in additional net cash inflows of $36,000 per year. The internal rate of return on the investment in the tractor-trailer is closest to: Select one: a. 15% b. 10% c. 13% d. 12%