Carleton Service Center just purchased an automobile hoist for $15,000.The hoist has a 5-year life and an estimated salvage value of $1,080. Installation costs were $2,900, and freight charges were $820. Carleton uses straight-line depreciation. The new hoist will be used to replace mufflers and tires on automobiles. Carleton estimates that the new hoist will enable his mechanics to replace four extra mufflers per week. Each muffler sells for $65 installed. The cost of a muffler is $35, and the labor cost to install a muffler is $10