Consider a 9-year 12% coupon bond with $1,000 par selling for $1,200 (semi-annual coupons). The only call date is 7 years from today and the call price is $1,100. The only put date is 8 years from today and the put price is $1,000. What is the bonds yield to worst? Express your answer in percent and round your answer to 2 decimal places. For example, if your answer is 0.09457, please write down 9.46 (without the percent sign).