Illustration:Maserati Corporation purchased a new machine for its assembly process on August 1, 2015.The cost of this machine was 150,000.The company estimated that the machine would have a salvage 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.

Instructions:Compute the depreciation expense under the following methods.

(a) Straight-line depreciation.

(b)Activity method

(c) Sum-of-the-years'-digits.

(d) Double-declining balance