Dexter Industries purchased packaging equipment on January 8 for $57,600. The equipment was expected to have a useful life of 3 years, or 14,400 operating hours, and a residual value of $3,600. The equipment was used for 5,760 hours during Year 1, 4,320 hours in Year 2, and 4,320 hours in Year 3. Required: 1. Determine the amount of depreciation expense for the 3 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 3 years by each method. Do not round intermediate calculations when determining the depreciation rate. Round the final answers for each year to the nearest whole dollar. Year Straight-Line Method Year 1 $ 18,000 Year 2 18,000 Year 3 18,000 Total $ 54,000 Depreciation Expense Units-of-Activity Method Double-Declining- Balance Method