HBM$,$ Inc has the following capital structure:

The common stock is currently selling for $$15$ a share, pays a cash dividend of $$0\mathrm{.}80$ per share, and is growing annually at $6$ percent. The preferred stock pays a $$10$ cash dividend and currently sells for $$93$ a share. The debt pays interest of $6\mathrm{.}5$ percent annually, and the firm is in the $30$ percent marginal tax bracket.

a$.$ What is the after$-$tax cost of debt? Round your answer to two decimal places.

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b$.$ What is the cost of preferred stock? Round your answer to two decimal places. $\%$

c$.$ What is the cost of common stock? Assume that the current $$0\mathrm{.}80$ dividend grows by $6$ percent during the year. Round your answer to two decimal places.

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d$.$ What is the firm's weighted$-$average cost of capital? Round your answer to two decimal places. $\%$