Coppola Company purchased a machine on January 1, 2011, for $20,000 cash. In addition, Coppola paid $4,000 to have the machine delivered and installed. The estimated useful life of the machine is 4 years, after which time it is expected to have a salvage value of $8,000. It is also estimated that the machine will produce 200,000 units of product during its useful life. Assuming that the straight-line depreciation method is used, what will be the machine's book value on December 31, 2013?