please help

Legend Service Center just purchased an automobile hoist for $20,960. The hoist has an 8 -year life and an estimated salvage value of $3,000. Installation costs and freight charges were $3,300 and $700, respectively. Legend uses straight-line depreciation. The new hoist will be used to replace mufflers and tires on automobiles. Legend estimates that the new hoist will enable his mechanics to replace five extra mufflers per week. Each muffler sells for $60 installed. The cost of a mutfer is $30, and the labor cost to install a muffler is $14 (a1) Compute the cash payback period and the annual rate of return. (Round cash paybock period to 0 decimal ploces, es. 25 and annual rate of return to 2 decimal places, eg.2.75\%. Cash payback period years Annual rate of return 98