A company is considering issuing a 7-year, 6.70% semi-annual coupon bond. To derive the appropriate yield to maturity (YTM), the investment banker finds two bonds with similar credit quality and coupon rates: A 4-year bond that is traded at the YTM of 8.98%, and a 9-year bond that is traded at the YTM of 7.12%. Using linear interpolation for the yield to maturity, what YTM should the investment banker use for the new 7-year bond