$8,$ A stock has a price of $$200$ and earnings per share of $$30.$ It pays out a dividend of $$16\mathrm{.}8.$ What is the sustainable rate of growth for its dividends? Express your answer as a $\%,$ for example if the answer is $7\mathrm{.}32\%$ then enter $7\mathrm{.}32$ in the answer box.