crockin corporation is considering a machine that will save $9,000 a year in cash operating costs each year for the next six years. at the end of six years it would have no salvage value. if this machine costs $33,165 now, the machine's internal rate of return is closest to (ignore income taxes.): refer to discount tables provided in class, to determine the appropriate discount factor(s). group of answer choices a) 16% b) 17% c) 18% d) 19%