Rowe and Company has an equity multiplier equal to $2\mathrm{.}0,$ a total assets turnover of $0\mathrm{.}25,$ and a profit margin of $10\%.$ Rowe has no preferred stock. The president is unhappy with the current return on equity, and he thinks it could be doubled. This could be accomplished $(1)$ by increasing the profit margin to $14\%$ and $(2)$ by increasing debt utilization. Total assets turnover will not change. The firm's total assets equal $$10$ million, its total current liabilities are $$400,000,$ and the firm has no short$-$term debt or preferred stock. What is the firm's total debt to total capital ratio if the ROE is doubled under these assumptions?

a$.0\mathrm{.}557$

b$.0\mathrm{.}600$

c$.0\mathrm{.}635$

d$.0\mathrm{.}706$

e$.0\mathrm{.}750$