Burton Excavating purchased a bulldozer onJanuary 1, 2016 The following information regarding this asset and its acquisition is available: Cost Residual Value Estimated Useful Life Estimated Services Hours $380,000 $30,000 8 years 60,000 The bulldozer was operated for a total of 6,100 hours in 2016 and 8,200 hours in 2017. Compute the depreciation expense for year ended December 31, 2016 and 2017 under each of the following methods: (1) (2) (3) (4) Double-declining-balance Sum-of-the-years'-digits Straight line Service hours (Units of Production)