ketches is considering an investment in its online portal. The investment will be evaluated using the firm's WACC. The firm's cost of debt is 4.5%, tax rate is 30%, and beta is 0.91. The risk-free rate is 1.5%, and the market risk premium is 5%. The firm's shares currently sell for $8/share and there are 455 million shares outstanding. The firm has $2.2 billion in debt which is currently selling at par value and $2.0 billion in book value of equity. The firm does not pay dividends. What is the best estimate of the firm's WACC based on this information?