the president and cfo of media corp cannot agree whether to use market value or book value weights in calculating the wacc. the company balance sheet shows a total of noncallable $45 million long-term debt with a coupon rate of 7.00% and a yield to maturity of 6.00%. this debt currently has a market value of $50 million. the company has 10 million shares of common stock, and the book value of the common equity (common stock plus retained earnings) is $65 million. the current stock price is $22.50 per share; stockholders' required return, r s, is 14.00%; and the firm's tax rate is 25%. the cfo thinks the wacc should be based on market value weights, but the president thinks book weights are more appropriate. what is the difference between these two waccs?