On January 1, 2013, Muoy Machining Co. purchased a compressor and related installation equipment for $72,500. The equipment had a three-year estimated life with a $12,500 salvage value. Straight-line depreciation was used. At the beginning of 2015, Muoy revised the expected life of the asset to four years rather than three years. The salvage value was revised to $2,500.
Compute the depreciation expense for each of the four years.