Dire Straits Co$.$ has a debt$/$equity ratio of $1\mathrm{.}6,$ cost of debt of $2\mathrm{.}45\%,$ and unlevered cost of capital of $6\mathrm{.}1\%.$ Find the cost of equity if the tax rate is $30\%.$

a$.$

$9\mathrm{.}99\%$

b$.$

$10\mathrm{.}19\%$

c$.$

$9\mathrm{.}59\%$

d$.$

$9\mathrm{.}79\%$

e$.$

$10\mathrm{.}39\%$