April 1 for $270,000. The equipment was expected Obj. 2 Perdue Company purchased equipment on April 1 for $270,000. The eau to have a useful life of three years or 18,000 operating hours, and a residual value of $0 000 The equipment was used for 7,500 hours during Year 1, 5,500 hours in Year 24000 . Year 3, and 1,000 hours in Year 4. Instructions Determine the amount of depreciation expense for the years ended December 31. Year 1 Year 2 Year 3, and Year 4, by (a) the straight-line method, (b) the units-of-activity method, and (c) the double-declining-balance method