A factory machine was purchased for $384000 on January 1, 2018. It was estimated that it would have a $76000 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 4100 actual hours in 2018. If the company uses the units-of-activity method of depreciation, the amount of depreciation expense for 2018 would be

$76000.

$63140.

$31570.

$39360.