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The Biz Company purchased a computer for $24,000. The estimated useful ife is 4 vears and the estimated salvage (residual) value is $2,000. Required: Calculate both depreciation expense and ending book value for each of the computer's 4 years using these methods: a. Straight-line depreciation b. Double-declining balance c. Units of production based on hours: Year 1 hours: 1,000 Year 2 hours: 2,000 Year 3 hours: 3,000 Year 4 hours: 10,0004,000