$($Weighted average cost of capital$)$ Crypton Electronics has a capital structure consisting of $37$ percent common stock and $63$ percent debt. A debt issue of $$1,000$ par value, $6\mathrm{.}5$ percent bonds that mature in $15$ years and pay annual interest will sell for $$980.$ Common stock of the firm is currently selling for $$29\mathrm{.}76$ per share and the firm expects to pay a $$2\mathrm{.}17$ dividend next year. Dividends have grown at the rate of $5\mathrm{.}4$ percent per year and are expected to continue to do so for the foreseeable future. What is Crypton's cost of capital where the firm's tax rate is $30$ percent?

a$.$ The after$-$tax cost of debt is $4\mathrm{.}70\%.($Round to two decimal places.$)$

b$.$ The cost of common equity is $\%.($Round to two decimal places.$)$

c$.$ Crypton's cost of capital is

$\%.($Round to three decimal places.$)$