Could you write out all the steps, please?

On January 1, 2017, you purchased a 10-year bond issued by Alpha Inc. at par. The bond features an 8% coupon (exist40 every six months) and a par value of exist1,000. Within minutes of purchasing the bond, Alpha announced financial problems, and the terms of the bond were renegotiated overnight. Going forward, Alpha will only pay a 6% coupon (exist30 every six months) and exist800 at maturity. The YTM rose to 24.43% on January 2, 2017. What is the true discount rate (nominal annual rate with semi-annual compounding) investors are applying to the renegotiated cash flows