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f1-5 (L01,2) (Depreciation Computations-Four Methods) Robert Parish Corporation purchased a new machine for its E11 assembl a salvage value of $12,900 at the end of its service life. Its life is estimated at 5 years,and its working hours are estimated at y process on August 1, 2017. The cost of this machine was $117,900. The company estimated that the machine would ave 21,000 hours. Year-end is December 31. Instructions Compute the depreciation expense under the following methods. Each of the following should be considered unrelated. (a) Straight-line depreciation for 2017. (b) Activity method for 2017, assuming that machine usage was 800 hours. d Sum-of-the-years'-digits for 2018. d) Double-declining-balance for 2018