Depreciation by Three Methods; Partial Years Perdue Company purchased equipment on October 1 for $48,700. The equipment was expected to have a useful life of three years, or 6,700 operating hours, and a residual value of $1,800. The equipment was used for 1,200 hours during Year 1, 2,300 hours in Year 2, 2,000 hours in Year 3, and 1,200 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-ofactivity method, and (c) the double-declining-balance method. Note: Round all final values for each depreciation method and each year to the nearest whole dollar. a. Straight-line method . b. Units-of-activity method c. Double-declining-balance method