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An item of equipment acquired on January 1, at a cost of $60,000, has an estimated use of 25,000 hours. During the first three years, the equipment was used 5,000, 6,000, and 4,000 hours, respectively. The equipment has an estimated life of five years and an estimated salvage of $10,000. Calculate the depreciation for the third year, using the sum of year .digits method