Windstreamers, Inc. acquired a piece of machinery on January 3, 2006. The total cost of the machinery was $68,400. Windstreamers estimated that the machinery would be used to produce 100,000 units of product before being sold for an estimated $11,600. Windstreamers uses the units-of-production method of depreciation. Assuming the machine produced 18,500 units during the year ended December 31, 2006, the 2006 depreciation expense was: (answer is 10,508)