Can someone help me with this question please!

A machine can be purchased for $278,000 and used for five years, yielding the following net incomes. In projecting net incomes, double-declining depreciation is applied using a five-year life and a zero salvage value. Year 5 Year 1 $11,500 Net income Year 2 $38,000 Year 3 $65,000 Year 4 $50,000 $126,000 Compute the machine's payback period (ignore taxes). (Round payback period answer to 3 decimal places.) Computation of Annual Depreciation Expense Year Beginning Book Value Annual Depr. (40% of Book Value) Accumulated Depreciation at Year-End Ending Book Value 1 2 3 4 5 Annual Cash Flows Year Net income Depreciation Net Cash Flow Cumulative Cash Flow 0 $ $ (278,000) (278,000) 11,500 1 2 38,000 3 65,000 4 50,000 126,000 65,000 50,000 126,000 65,000 115,000 241,000 5 Payback period = years