Swifty Service Center just purchased an automobile hoist for $32,100. The hoist has an 8-year life and an estimated salvage value of $3,200. Installation costs and freight charges were $3,500 and $800, respectively. Swifty uses straight-line depreciation. The new hoist will be used to replace mufflers and tires on automobiles. Swifty 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 $39, and the labor cost to install a muffler is $15. (a) Compute the cash payback period for the new hoist. Cash payback period years (b) Compute the annual rate of return for the new hoist. (Round answer to 2 decimal places, 6.9. 10.52%.) Annual rate of return %