Niendorf Corporation's 25-year maturity bonds have an 8.75% coupon rate with interest paid semiannually, and a par value of $1,000. The bonds are currently selling at a premium price of $1,250 in the bond market. What is their yield to maturity (YTM)? Enter your answer rounded to two decimal places. Do not enter % in the answer box. For example, if your answer is 0.12345 or 12.345% then enter as 12.35 in the answer box.