Cullumber Ltd. purchased a new machine on April 4, 2017, at a cost of $176,000. The company estimated that the machine would have a residual value of $16,000. The machine is expected to be used for 10,000 working hours during its four-year life. Actual machine usage was 1,700 hours in 2017;2,100 hours in 2018;2,500 hours in 2019;2,100 hours in 2020 ; and 1,600 hours in 2021 . Cullumber has a December 31 year end. (a) Calculate depreciation for the machine under each of the following methods: (Round expense per unit to 2 decimal places, e.g. 2.75 and final answers to 0 decimal places, e.g. 5,275.) (1) Straight-line for 2017 through to 2021. 2017 expense $ 2018 expense $ 2019 expense $ 2020 expense $ 2021 expense $ (2) Diminishing-balance using double the straight-line rate for 2017 through to 2021 . (2) Diminishing-balance using double the straight-line rate for 2017 through to 2021. 2018expense$$$$ (3) Units-of-production for 2017 through to 2021. $ 2018 expense $ $ $ $ Which method results in the highest depreciation expense over the life of the asset? Highest net income? Highest cash flow? Which method results in the highest net income? Which method results in the highest cash flow