Dexter Industries purchased packaging equipment on January 8 for $556,000. The equipment was expected to have a useful life of four years, or 10,000 operating hours, and a residual value of $46,000. The equipment was used for 3,500 hours during Year 1, 2,100 hours in Year 2, 2,800 hours in Year 3, and 1,600 hours in Year 4. Required: 1. Determine the amount of depreciation expense for the four years ending December 31 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. Round the answer for each year to the nearest whole dollar.