If a firm has a cost of debt of 8.9% (with a market value of debt outstanding equal to $6,000,000) and a cost of equity of 13.3% (with a current stock price of $11.9 and 1,000,000 shares outstanding), what is the firm's WACC, given a 27% tax rate? (answer in PERCENT, but without the percent sign, e.g. "10.2" is 10.2%)