home / study / business / finance / finance questions and answers / bond yields: stone sour corp. issued 20 year bonds two years ago at a coupon rate of 7.1 percent. ... Question: Bond Yields: Stone Sour Corp. issued 20 year bonds two years ago at a coupon rate of 7.1 percent.... Bond Yields: Stone Sour Corp. issued 20 year bonds two 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 to figure in Excel?