Depreciation by Three Methods; Partial Years

McMullen Company purchased tool sharpening equipment on May 1 for $162,000. The equipment was expected to have a useful life of three years, or 12,000 operating hours, and a residual value of $3,600. The equipment was used for 2,400 hours during Year 1, 3,900 hours in Year 2, 4,050 hours in Year 3, and 1,650 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. FOR DECLINING BALANCE ONLY, round the answer for each year to the nearest whole dollar.