The Collins Group, a leading producer of custom automobile accessories, has hired you to estimate the firm's weighted average cost of capital. The balance sheet and some other information are provided below. Assets Current assets $ 38,000,000 Net plant, property, and equipment 101.000.000 Total assets $139.000.000 Liabilities and Equity Accounts payable $ 10,000,000 Accruals 9.000.000 Current liabilities $ 19,000,000 40.000.000 Long-term debt (40,000 bonds. $1,000 par value) Total liabilities $ 59.000.000 Common stock (10,000,000 shares) 30,000,000 Retained earnings 50.000.000 Total shareholders equity 80.000.000 Total liabilities and shareholders equity $139.000.000 The stock is currently selling for $15.25 per share, and its noncallable $1.000 par value, 20-year. 7.25% bonds with semiannual payments are selling for $875.00. The beta is 1.25. the yield on a 6 month Treasury bill is 3.50%, and the yield on a 20-year Treasury bond is 5.50%. The required retum on the stock market is 11.50%, but the market has had an average annual return of 14.50% during the past 5 years. The firm's tax rate is 25%. Which of the following is the best estimate for the weight of debt for use in calculating the firm's WACC? O 18.67% 21.61% 19.60% 20.58%