not sure what I have done wrong here

A machine can be purchased for $274,000 and used for five years, ylelding the following net Incomes. In protec double-declining depreciation is applied using a five-year life and a zero salvage value. a Yean 3 $72,000 Year 4 $48,500 Year 5 $113,000 Net income $23, see $46, 080 Compute the machine's payback period (Ignore taxes). (Round payback perlod answer to 3 decimal places.) * Answer is complete but not entirely correct. Ending Book Value Year Computation of Annual Depreciation Expense Beginning Annual Depr. Accumulated Book (40% of Book Depreciation at Value Value) Year-End 274 000 109.600 109.600 164 400 65.760 175.360 164.400 1 93.640 2. 59 184 214,816 08.640 00 35.510 4 288,490 59.184 4 39.456 23.674 14,204 X 21.306 252.894 Un 35,510