(Ignore income taxes in this problem.) The Jackson Company has invested in a machine that cost $70,000, that has a useful life of seven years, and that has no salvage value at the end of its useful life. The machine is being depreciated by the straight-line method, based on its useful life. It will have a payback period of four years. Given these data, the simple rate of return on the machine is closest to: A) 7.1% B) 8.2% C) 10.7% D) 39.3%