Depreciation by three methods; partial years Layton Company purchased tool sharpening equipment on October 1 for $64,260. The equipment was expected to have a useful life of 3 years or 5,940 operating hours, and a residual value of $1,890. The equipment was used for 1,100 hours during Year 1, 2,100 hours in Year 2, 1,800 hours in Year 3, and 940 hours in Year 4. Required: 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. Note: FOR DECLINING BALANCE ONLY, round the multiplier to four decimal places. Then round the answer for each year to the nearest whole dollar. a. Straight-line method b. Units-of-activity method c. Double-declining-balance method