Sandhill Corp had sales of $$388,000$ in $2017.$ If management expects its sales to be $$476,450$ in $3$ years, what is the annual rate at which the company's sales are expected to grow? $($Round intermediate calculations to $4$ decimal places, e$.$g$.2\mathrm{.}5125$ and final answer to $2$ decimal places, e$.$g$.2,515\mathrm{.}25.)$

Annual growth rate $\%$