A machine can be purchased for $90,000 and used for five years, yielding the following income. This income computation includes annual depreciation expense of $18,000. Income Year 1 $6,000 Year 2 $15,000 Year 3 $36,000 Year 4 $22,500 Year 5 $60,000 Compute the machine's payback period. (Round payback period answer to 2 decimal places.) Year Net Income Depreciation Net Cash Flow Cumulative Net Cash Flow Initial invest $ (90,000) $ (90,000) Year 1 Year 21 $ 6,000 15,000 Year 3 36,000 Year 4 22.500 Year 5 60,000 Payback period=