Stone Sour Corp. issued 20-year bonds 2 years ago at a coupon rate of 7.1 percent. The bonds make semiannual payments. If these bonds currently sell

Stone Sour Corp. issued 20-year bonds 2 years ago at a coupon rate of 7.1 percent. The bonds make semiannual payments. If these bonds currently sell for 105 percent of par value, what is the YTM? How do you plug the answer in an excel format?