Left Company is considering the acquisition of a new machine that will cost $470,000. The machine will have a six year life with no salvage value. The net cash infLows expected to be produced by the machine are: h inflow $120,000 $ 60,000 $140,000 $100,000 $100,000 $ 50,000 Year 2 Year 3 .___. .. . Year 5 Year 6 The payback period for the machine is closest to: 2 1/2 years 3 years 3 1/2 years 4 years 4 1/2 years years 5 1/2 years 6 years unable to determine without knowing the cost of capital