A bond is issued with a coupon of $4\%$ paid annually, a maturity of $39$ years, and a yield to maturity of $7\%.$ What rate of return will be earned by an investor who purchases the bond for $$602\mathrm{.}05$ and holds it for $1$ year if the bond$$s yield to maturity at the end of the year is $9\%?$

Note: 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.