At december 31, 2013, before recognizing any depreciation expense for 2013, y company has a machine with an original cost of $360, 000 and accumulated depreciation of $90,000. The machine is used to manufacture a specific product and at December 31, 2013, has a remaining useful life of 7 years with no salvage value. The machine was used to produce 10,000 units in the current year, 20,000 units in the previous years and is expected to be used to produce an additional 50,000 units over its remaining life. If y company uses the units of production method for calculating depreciation, depreciation expense in 2013 will be what?