Depreciation by Three Methods; Partial Years Perdue Company purchased equipment on October 1 for $51,040. The equipment was expected to have a useful life of three years, or 7,000 operating hours, and a residual value of $2,040. The equipment was used for 1,300 hours during Year 1, 2,500 hours in Year 2, 2,100 hours in Year 3, and 1,100 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 final 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 i Year Year 1 Year 2 Year 3 Amount