A factory machine was purchased for $375,000 on January 1, 2017. It was estimated that it would have a $75,000 salvage value at the end of its 5-year useful life. It was also estimated that the machine would be run 40,000 hours in the 5 years. The company ran the machine for 4,000 actual hours in 2017. If the company uses the units-of-activity method of depreciation, the amount of depreciation expense for 2017 would be Ion Select one: a $30,000 $75,000 C$60,000 $37.500