Zinc Co. owns 100% of Concord Inc. On January 2, 20x1, Zinc sold equipment with an original cost of $80,000 and a carrying amount of $48,000 to Concord for $72,000. Zinc had been depreciating the equipment over a 5-year period using straight-line depreciation with no residual value. Concord is using straight-line depreciation over 3 years with no residual value. In Zinc's December 31, 20x1, consolidating worksheet, by what amount should depreciation expense be decreased? Show all work.