Lawson Co. is considering purchasing a new machine which will cost $350,000, but which will decrease costs each year by $70,000. The useful life of the machine is 10 years. The machine would be depreciated straight-line with no residual value over its useful life at the rate of $20,000/year. The cash payback period is O 7.0 years. 4.5 years 5.0 years. 10,0 years