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E9-6 Rottino Company S150,000. 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 Compute the depreciation expense under the following methods for the year indicated. (a) Straight-line for 2019 (b) Units-of-activity for 2019, assuming machine usage was 1,700 hours. (c) Declining-balance using double the straight-line rate for 2019 and 2020. purchased a new machine on October 1, 2019, at a cost of