At what annual interest rate, compounded annually, would $$520$ have to be invested for it to grow to $$1,960\mathrm{.}91$ in $15$ years? Question content area bottom Part $1$ The annual interest rate, compounded annually, at which $$520$ must be invested for it to grow to $$1,960\mathrm{.}91$ in $15$ years is $($type your answer as a percentage, round to two decimal places$)$ enter your response here $\%.$