Ursala, Incorporated, has a target debt$-$equity ratio of $1\mathrm{.}80.$ Its WACC is $8\mathrm{.}6$ percent and the tax rate is $21$ percent.If the company$$s cost of equity is $12\mathrm{.}6$ percent, what is its pretax cost of debt?If instead you know that the aftertax cost of debt is $7\mathrm{.}1$ percent, what is the cost of equity?