Maserati Corporation purchased a new machine for its assembly process on August 1, 2012. The cost of this machine was $198,000. The company estimated that the machine would have a salvage value of $31,680 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. Compute the depreciation expense under the following methods. Each of the following should be considered unrelated. Double-declining balance for 2013