John Ltd. is discussing new ways to recapitalize the firm and raise additional capital. Its current capital structure has a 30% weight in ordinary equity, 10% in preferred stock, and 60% in debt. The cost of ordinary equity is 20%, the cost of preferred stock is 14%, and the pretax cost of debt is 10%. What is the firm's (after-tax) weighted average cost of capital (in percentage terms) if its marginal tax rate is 40%? [Type only the final answer into the response box below (NOT into the Notes box) and in pure numeric format. Do NOT use %/$ signs, commas or spaces (e.g. only enter 10 if it is 10 days/$10/10%)]