Porter Co. is analyzing two projects for the future. Assume that only one project can be selected. Project X Project Y Cost of machine $ 66,200 $ 67,700 Net cash flow: Year 1 23,400 4,700 Year 2 23,400 30,700 Year 3 23,400 30,700 Year 4 0 23,500 The payback period in years for Project Y is