Maserati purchased a new machine for its assembly process on August 1, 2019. The cost of this machine was $150,000. The company estimated that the machine would have a residual value of $24,000 at the end of its service life. Its life is estimated at 5 years, and its working hours are estimated at 21,000 hours. Year-end is December 31.

Required:

Compute the depreciation expense under the following methods. Each of the following should be considered unrelated.

(a) Straight-line depreciation for 2019.

(b) Activity method for 2020, assuming that machine usage was 800 hours.

(c) Sum-of-the-years'-digits for 2020. (d) Double-declining-balance for 2020.