A factory machine was purchased for $25,000 on January 1, 2003. It was estimated that it would have a $5,000 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. If the actual number of machine hours ran in 2003 was 4,000 hours and the company uses the units-of-activity method of depreciation, what the amount of depreciation expense for 2003 would be?