Charlie Company is considering purchasing a machine that costs $400,000 and is estimated to have no salvage value at the end of its 8-year useful life. If the machine is purchased, annual revenues are expected to be $100,000 and annual operating expenses exclusive of depreciation expense are expected to be $38,000. The straight-line method of depreciation would be used. The cash payback period on the machine is 01) 3.2 years. 02) 8.0 years. 03) 6.5 years. 04) 7.5 years