13. On January 1,2007, Flax Co. purchased a machine for $528,000 and depreciated it by the straightline method using an estimated useful life of eight years with no salvage value. On January 1,2010, Flax determined that the machine had a useful life of six years from the date of acquisition and will have a salvage value of $48,000. An accounting change was made in 2010 to reect these additional data. The accumulated depreciation for this machine should havea balance at December 31, 2010, of a. $292,000 b. $308,060 c. $320,000 d. $352.000