Covey Company purchased a machine on January 1, 2008, by paying cash of $250,000. The machine has an estimated useful life of five years (or the production of 500,000 units) and an estimated residual value of $25,000. Required: A. Determine depreciation expense (to the nearest dollar) and book value for each year of the machine's useful life under (1.) straight-line depreciation; and (2.) the 200% declining balance method. B. If the machine was used to produce and sell 120,000 units in 2008, what would the depreciation expense be under the units of production method?