15 PTTGC has 3700 bonds with face value of 1000. The market price of bond is now 1045 each. The yield to maturity of the bond is 5%. The tax rate is 20%. The firm has 133000 shares of common stocks outstanding at a market price of 105 a share. The common stock just paid an annual dividend of 5.25 with a constant growth of dividend of 3%. What is PTTGS's weighted average cost of capital? a) 7.3% b) 6.1% c) 4.9% d) 12.0% e) 4.3% f) 3.8%