Dexter Industries purchased packaging equipment on January 8 for $87,200. The equipment was expected to have a useful life of three years, or 20,000 operating hours, and a residual value of $7,200. The equipment was used for 8,590 hours during Year 1, 7,370 hours in Year 2, and 4,040 hours in Year 3 Prepare a depreciation schedule .under the straight line , units of activity and double declining method.