Waylander Coatings Company purchased waterproofing equipment on January 6 for $320,000. The equipment was expected to have a useful life of four years, or 20,000 operating hours, and a residual value of $35,000. The equipment was used for 7,200 hours during Year 1, 6,400 hours in Year 2, 4,400 hours in Year 3, and 2,000 hours in Year 4. Required: 1. 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. Also determine the total depreciation expense for the four years by each method