Rottino Company purchased a new machine on October 1, 2017, at a cost of $150,000. The company estimated that the machine will have a salvage value of $12,000. The machine is expected to be used for 10,000 working hours during its 5-year life. Instructions (1). Compute the depreciation expense under the following methods for the year indicated. (a) Straight-line for 2017. (b) Units-of-activity for 2017, assuming machine usage was 1,700 hours. (c) Declining-balance using double the straight-ine rate for 2017 and 2018. NOTE: Enter a number in cells requesting a value; enter either a number or a formula in cells witha?" (2). Re-compute the 3 methods assuming cost of asset is now $180,000, machine usage is 2,100 hours