A machine can be purchased for $150,000 and used for five years, yielding the following net incomes

A machine can be purchased for $150,000 and used for five years, yielding the following net incomes. In projecting net incomes, straight-line depreciation is applied using a five-year life and a zero salvage value. 
Net income 
Year 1 $10,000 
Year 2 $25,000 
Year 3 $50,000 
Year 4 $37,500 
Year 5 $100,000 
Compute the machine's payback period (ignore taxes). (Round payback period answer to 3 decimal places.) 
Year Net Income Depreciation Net Cash Flow Cumulative Cash Flow 0 $ (150,000) $ (150,000) 1 $ 10,000 2 25,000 3 50,000 4 37,500 5 100,000 Payback period =