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Greg's Copy Shop bought equipment for $60,000 on January 1, 2006. Greg estimated the useful life to be 3 years with no salvage value, and the straight-line method of depreciation will be used. On January 1, 2007, Greg decides that the business will use the equipment for a total of 5 years. What is the revised depreciation expense for 2007?a. $20,000b. $8,000c. $10,000d. $15,000