Seabridge Corporation is currently a levered firm. The company has a levered cost of equity of $12\mathrm{.}60$ percent and a pretax cost of debt of $6\mathrm{.}5$ percent. If the company is unlevered, its cost of capital will be $9\mathrm{.}54\%.$ The tax rate is $45$ percent. What is the company's current debt$-$equity ratio?

$1\mathrm{.}71$

$1\mathrm{.}74$

$1\mathrm{.}77$

$1\mathrm{.}80$

$1\mathrm{.}83$