E11-5 (Depreciation Computations-Four Methods) Maserati Corporation purchased a new machine for its assembly process on August 1, 2010. 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. Each of the following should be considered unrelated. (a) Straight-line depreciation for 2010. (b) Activity method for 2010, assuming that machine usage was 800 hours. (c) Sum-of-the-years-digits for 2011 (d) Double-declining-balance for 2011