Cullumber Company is evaluating the purchase of a rebuilt spot-welding machine to be used in the manufacture of a new product. The machine will cost $185,000, has an estimated useful life of 7 years and a salvage value of zero, and will increase net annual cash flows by $40,540. Click here to view the factor table. What is its approximate internal rate of return? (Round answer to O decimal place, e.g. 13%.) Internal rate of return