Chris Anderson bought 10 -year, 11.50 percent coupon bonds issued by the U.S. Treasury three years ago at $912.38. If he sells these $1,000 face value bonds, at the current price of $840.18, what is his realized yield on the bonds? Assume similar coupon-paying bonds make annual coupon payments. (Round intermediate calculations to 5 decimal places, e.g. 1.25145 and final answer to 2 decimal places, e.g. 15.25\%.) Realised rate of return %