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A factory machine was purchased for $375000 on January 1, 2021. It was estimated that it would have a $75000 salvage value at the end of its 5-year useful life. It was also estimated that the machine would be run 40000 hours in the 5 years. The company ran the machine for 4000 actual hours in 2021. If the company uses the units-of-activity method of depreciation, the amount of depreciation expense for 2021 would be $37500. $75000. $60000. $30000.