Covey Company purchased a machine on January 1, 2010, by paying cash of $250,000. The machine has an estimated useful life of five years, is expected to produce 500,000 units, and has an estimated residual value of $25,000. Requirements: Calculate depreciation expense (to the nearest dollar) for each year of the machine's useful life under the 200% declining balance method. What is the book value of the machine after three years using the 200% declining- balance method. If machine was used to produce and sell 120,000 units in 2010, what would the depreciation expense be under the units of production method