You are contemplating about whether to use book value or market value waghts in WACC calculation. Your firm's balance sheet shows a total of non-callable $40 million long -tem debt with a coupon rate of 6% and a yidd to maturity of 5%. This debt currently has a market value of $50 million. The company has 10 million shares of common stock, and the stock has a book value per share of $6.00. The current stock price is $20.00 per share; stockholders' required return, rs is 10%; and the firm's tax rate is 30%