A factory machine was purchased for $385000 on January 1, 2021. It was estimated that it would have a $78000 salvage value at the end of its 5-year useful life. It was also estimated that the machine would be run 38000 hours in the 5 years. The company ran the machine for 3800 actual hours in 2021. If the company uses the units-of-activity method of depreciation, the amount of depreciation expense for 2021 would be O $38500 O $61400. O $30700 O $78000