Barton industries expecte that its target capital structure for raising funds in the future for its capital budget will consist of $40\%$ debt, $5\%$ preferred stock and $55\%$ common equity. Note that the firms marginal tax rate is $25\%.$ Assume that the firms cost of debt is $10\mathrm{.}7\%$ the firms cost of preferred stock is $9\mathrm{.}9\%$ and the firms cost of equity is $13\mathrm{.}3\%$ for old equity and $13\mathrm{.}8\%$ for new equity what is the firms weighted average cost of capital if it uses retained earnings as its source of common equity. What is the firms weighted average cost if capital if it has to issue new common stock