On January 3, 2014 Robby's Excavating Company purchased a bulldozer for $140,000. In addition to the basic purchase price the company paid sales tax of $6,000 and freight charges of $8,000. The bulldozer will be used for 36,000 machine hours. Robby estimates that the bulldozer will have a useful life of 5 years and no residual value. Compute the cost of the asset. Compute the depreciation expense for 2014 and 2015 using the straight line method, units of production method assuming the bulldozer was used 5,000 machine hours in 2014 and 20,000 machine hours in 2015, double declining balance method