A firm's assets are financed by $23 million in debt and $19 million in equity. The firm has an after-tax cost of debt of 3.9 percent and a cost of equity of 10.8 percent. What is the firm's weighted average cost of capital (WACC)? Answer in percent to 2 decimal places and do not include the % sign. For example, if the return is 2.04%, you should enter 2.04 as the answer.