Sapp Trucking

Sapp trucking balance sheet shows a total of noncallable $45 million long-term debt with a coupon rate of 7% and a yield to maturity of 6%. this debt currently has a market value of $ 50 million. the balance sheet also shows that the company has 10 million shares of common stock, and the book value of the common equty (common stock plus retained earnings0 is $65 million. the current stock price is $22.50 per share. stockholders required return rs. is 14%, and the firms tax rate is 40%. The CFO thinks that 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?