Answer:
b. 12.24% 
Step-by-step explanation:
The computation is shown below;
The cost of debt is 11% 
As when the bonds would be sell at par value so yield to maturity = coupon rate = cost of debt i.e. 11% 
Now 
cost of equity= ((Do × (1+g)) ÷ P)+g 
= (($2.05 × (1 + 7%)) ÷ 27) + 7
= 15.12% 
 Now 
WACC = weight of equity × cost of equity + weight of preferred equity × cost of equity + weight of debt × cost of debt × (1 - tax rate) 
 = 55% × 15.12% + 5% ×12.4% + 40% × 11% × (1 - 25%) 
 = 12.24%