annually on 12/31. The bonds sold at par on 1/1/2005. On 12/31/2005, Greeze paid the required interest, but then announced that they had no intention of paying the rest of what they owed. 

In January of 2005, the country of Greeze issued 10-year, 8% coupon bonds, with interest paid

 In January of 2005, the country of Greeze issued 10-year, 8% coupon bonds, with interest paid

annually on 12/31. The bonds sold at par on 1/1/2005. On 12/31/2005, Greeze paid the required interest, but then announced that they had no intention of paying the rest of what they owed.

Greeze said that going forward, they would pay only 4% for the remaining 9 years. And at maturity, investors should only expect to receive $600, instead of the $1,000 par value. Bond investors worldwide accepted the offer (rather than declaring war). And all bond investors agree that an appropriate discount rate for the remaining cash flows was 15%.

What is the resulting YTM for this bond?