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 $162,000. has an estimated useful life of 7 years and a salvage value of zero, and will increase net annual cash flows by $33,280, Click here to view the factor table. What is its approximate internal rate of return? (Round answer to O decimal place, es, 13%) Internal rate of return %