Kelso's has a debt$-$equity ratio of $0\mathrm{.}6$ and a tax rate of $35$ percent. The firm does not issue preferred stock. The cost of equity $($rs$)$ is $14\mathrm{.}5$ percent and the aftertax cost of debt $($rd$)$ is $4\mathrm{.}8$ percent. What is the weighted average cost of capital?

Question $9$ options:

$10\mathrm{.}46$ percent

$10\mathrm{.}67$ percent

$10\mathrm{.}86$ percent

$11\mathrm{.}38$ percent

$11\mathrm{.}57$ percent