Your firm currently has a debt to equity ratio of $0\mathrm{.}2$ and wishes to maintain this ratio over time as the company grows. Calculate the level of growth in sales that can be supported following a sustainable growth rate approach. Provide your answer in percent form, without the percent sign $($X$.$YZ$,$ not X$.$YZ$\%$ or $0\mathrm{.}0$XYZ$).$

Net income forecast: $$2,400,000$

Book Equity: $$30,000,000$

$\%$ of Assets made up by Equity: $60\%$

$\%$ of net income paid to shareholders: $9\%$