Depreciation by Three Methods; Partial Years Perdue Company purchased equipment on April 1 for $47,910. The equipment was expected to have a useful life of three years, or 6,600 operating hours, and a residual value of $1,710. The equipment was used for 1,200 hours during Year 1,2,300 hours in Year 2,2,000 hours in Year 3, and 1,100 hours in Year 4