(6). Zaid Company purchased a new machine on June 1, 2021, at a cost of $96,000. The company estimated that the machine will have a salvage value of $12,000. The machine is expected to be used for 42,000 working hours during its 7- year life. Instructions Compute the depreciation expense under the following methods for the year indicated. (a). Straight-line for 2021. (0.7 mark) (b). Units-of-activity for 2021, assuming machine usage was 6,500 hours. (0.7 mark) (c). Declining-balance using double the straight-line rate for 2021 and 2022. (1.1 marks)