Culver Service Center just purchased an automobile hoist for $33,800. The hoist has an 8-year life and an estimated salvage value of $3,140. Installation costs and freight charges were $4,260 and $900, respectively. Culver uses straight-line depreciation.

The new hoist will be used to replace mufflers and tires on automobiles. Culver estimates that the new hoist will enable his mechanics to replace 5 extra mufflers per week. Each muffler sells for $74 installed. The cost of a muffler is $38, and the labor cost to install a muffler is $16.

Could you explain to me how I get the cash back?