A firm seeks maximum growth rate of $3\mathrm{.}68\%$ by relying on internal and external financing such that the debt$-$to$-$equity ratio remains constant. At the same time, the firm wants to maintain a dividend payout ratio of $38\%$ and a profit margin of $7\%.$ The firm can generate $$0\mathrm{.}5$ in sales for every $$1$ in assets. What is the debt equity ratio that is required to achieve the firm's desired rate of growth?