A bond has a face value of $1,000, a coupon of 6% paid annually, a maturity of 41 years, and a yield to maturity of 9%. What rate of return will be earned by an investor who purchases the bond for $676.40 and holds it for 1 year if the bonds yield to maturity at the end of the year is 10%? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. Negative amount should be indicated by a minus sign.)