nc jelly donuts had sales of $$5$ million in $2021$ and year$-$end total assets were $$2\mathrm{.}5$ million. also, at year end $2021$ current liabilities were $$1$ million, comprised of $$300,000$ notes payable, $$500,000$ accounts payable and $$200,000$ of accurals spontaneous liabilities and total assets are expected to increase at the same rate as sales. if net margin is expected to hold at $7\%$ and the dividend payout ratio at $80\%,$ by what percentge can sales increase without having to raise funds externally. what is the self supporting growth rate

a$.4\mathrm{.}05\%$

b$.5\mathrm{.}72\%$

c$.6\mathrm{.}33\%$

d$.8\mathrm{.}70\%$