CofC Inc's consolidated pro$-$forma financial statements are below. Historically, CofC has grown at $30\%$ which required external financing. If the managers of CofC Inc no longer want to take on any external financing, what is the maximum growth rate that can be achieved while adhering to their goal of no external financing?

NI $300$

Dividends $200$

Total Assets $1200$

Total Debt $500$

Total Equity $700$

Question $16$ options:

$20\mathrm{.}00\%$

$30\mathrm{.}00\%$

$9\mathrm{.}09\%$

$16\mathrm{.}67\%$