Perdue Company purchased equipment on April 1 for $270,000. The equipment was expected to have a useful life of three years or 18,000 operating hours, and a residual value of $9,000. The equipment was used for 7,500 hours during Year 1, 5,500 hours in Year 2, 4,000 hours in Year 3, and 1,000 hours in Year 4.

Instructions

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.