6. An anticipated purchase of equipment for S500,000, with a useful life of 8 years and no residual value, is expected to yield to the following annual net incomes and net cash flows: Net Income $60,000 50,000 50,000 240,000 40,000 40,000 20,000 40,000 Net Cash Flows $110,000 100,000 100,000 160,000 30,000 30,000 30,000 30,000 ear 4 What is the cash back period