If a firm has a cost of debt of 6.5% (with a market value of debt outstanding equal to $3,000,000) and a cost of equity of 13.3% (with a current stock price of $14.7 and 1,000,000 shares outstanding), what is the firm's weighted average after-tax cost of capital (given a 22% tax rate)? (answer in PERCENT, but without the percent sign, e.g. "10.2" is 10.2%)