(ignore income taxes in this problem) the management of Stanforth corporation is investigating automating a process. old equipment, with a current salvage value of $15,000, would be replaced by a new machine. the new machine would be purchased for $408,000 and would have a 6 year useful life and no salvage value. by automating the process, the comp would save $141,000 per year in cash operating costs. the simple rate of return on the investment is closest to: 18.6% 17.9% 34.6% 16.7%