Perdue Company purchased equipment on April 1 for $56,430. The equipment was expected to have a useful life of three years, or 7,800 operating hours, and a residual value of $1,830. The equipment was used for 1,400 hours during Year 1, 2,700 hours in Year 2, 2,300 hours in Year 3, and 1,400 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: Round all values for each depreciation method and each year to the nearest whole dollar. a. Straight-line method Year Year 1 Amount Year 2 Year 3 Year 4 b. Units-of-activity method Year Year 1 Year 2 $ Year 3 Amount Year 4 c. Double-declining-balance method Year Year 1 Year 2 Year 3 Year 4 Amount