Assume that Healthy Living is considering buying some equipment (Machine 1) for 210,000, with an estimated useful life of 11 years, and zero predicted residual value. Managers expect use of the equipment to generate 35,000 of net cash inflows from operations per year. Calculate the payback period. Suppose that an alternative to the 210,000 piece of equipment is another one (Machine 2) that also costs 210,000 but will generate 42,000 per year during its five-year life. What is the payback period? Which of the two pieces of equipment is preferable and why?