Enron Manufacturing acquired equipment on 1 January 20X3 for $300,000. The equipment had an estimated useful life of 10 years and an estimated salvage value of $25,000. On 1 January 20X6 Enron Manufacturing revised the total useful life of the equipment to 12 years. Compute depreciation expense for the year ended 31 December 20X6, if Enron Manufacturing uses straight-line depreciation