A factory machine was purchased for $375000 on January 1, 2018. 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 years. The company ran the machine for 3800 actual hours in 2018. If the company uses the units-of-activity method of depreciation, the amount of depreciation expense for 2018 would be $35625 $75000 $28500, $57000