please solve this accounting problem

Comparing Three Depreciation Methods Dexter Industries purchased packaging equipment on lanuary 8 for $686,800. The equipment was expected to have a useful life of four years, or 8,400 operating hours, and a residual value of $56,800. The equipment was used for 2,940 hours during Year 1, 1,764 hours in Year 2,2,352 hours in Year 3, and 1,344 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 vear to the nearest whole dollar. 2. What method vields the highest depreciation expense for Year 1 ? 3. What method vields the most depreciation over the fout-year life of the equipment