Afactory machine was purchased for $200000 on January 1, 2022. It was estimated that it would have a $20000 salvage value at the end of its 5-year useful life. It was also estimated that the machine would be run 50000 hours in the 5 years. If the actual number of machine hours ran in 2022 was 5000 hours and the company uses the units-of-activity method of depreciation, the amount of depreciation expense for 2022 would be O $40000. O $18000. O $36000. O $20000