Newbirth Coatings Company purchased waterproofing equipment to have a useful life of four years, or 8,000 operating hours, and a residual value of $36,000. The equipment was used for 3,000 hours during 2009, 2500 hours in 2010, 1400 hours in 2011, and 1,100 hours in 2012
Determine the amount of depreciation expense for the years ended December 31, 2009, 2010, 2011 and 2012, by (a) the straight line depreciation method (b) the units of production method, and (c) the the double declining -balance method.