Sharoah Ltd. purchased a new machine on April 4,2017 , at a cost of $180,000. The company estimated that the machine would have a esidual value of $16,000. The machine is expected to be used for 10,000 working hours during its four-year life. Actual machine usage vas 1,500 hours in 2017; 2,200 hours in 2018; 2,500 hours in 2019; 2,000 hours in 2020; and 1,800 hours in 2021. Pharoah 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