Maggie's Muffins Bakery generated $$4$ million in sales during $2018,$ and its year$-$end total assets were $$2\mathrm{.}4$ million. Also, at year$-$end $2018,$ current liabilities were $$1$ million, consisting of $$300,000$ of notes payable, $$500,000$ of accounts payable, and $$200,000$ of accruals. Looking ahead to $2019,$ the company estimates that its assets must increase at the same rate as sales, its spontaneous liabilities will increase at the same rate as sales, its profit margin will be $6\%,$ and its payout ratio will be $75\%.$ How large a sales increase can the company achieve without having to raise funds externally$$that is$,$ what is its self$-$supporting growth rate? Do not round intermediate calculations. Round the monetary value to the nearest dollar and percentage value to the nearest whole number.

Sales can increase by $

$,$ that is by

$4$

$\%.$