An investor purchases a $10-$year, $8\%$ annual coupon bond at $$85\mathrm{.}503075.$ The bond$$s yield$-$to$-$maturity goes up from $10\mathrm{.}40\%$ to $10\mathrm{.}80\%$ after the purchase $($before the first coupon is received$).$ What is the realized rate of return on this bond?

Please input the answer as percentages $($for example, if the answer is $14\mathrm{.}56\%,$ put in $14\mathrm{.}56).$