Frozen Carrot has a retention ratio of $\mathrm{.}70,$ dividends of $$80,000,$ and total equity of $$4\mathrm{.}0$ million. What is the firm's sustainable rate of growth?

Multiple Choice

$3\mathrm{.}92\%$

$4\mathrm{.}29\%$

$4\mathrm{.}67\%$

$6\mathrm{.}47\%$

$6\mathrm{.}83\%$