8. A factory machine was purchased for $75,000 on January 1, 2008. It was estimated that it would have a $15,000 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 2008. If the company uses the units-of-activity method of depreciation, the amount of depreciation expense for 2008 would be a. $7,500. b. $12,000. c. $15,000 d. $6,000