Answer:
a.Year   Cashflow    [email protected]%      PV           [email protected]%     PV
                $                                 $                                  $
   0        (1,000)           1           (1,000)           1          (1,000)
 1-15          72             11.1184    800          7.6061        548
 15         1,000          0.5553    555.3      0.2394        239
                                   NPV      355.3              NPV    213                    
Kd = LR     + NPV1/NPV1 + NPV2    x (HR – LR)
Kd = 4       + 355.3/355.3 + 218   x (10 – 4)
Kd = 4       + 355.3/573.3 x 6
Kd = 7.72%    
b. Kp = D/Po
    Kp = $100/$1,111
   Kp = 0.09 = 9%
c. Ke = D1/Po (1 – FC)  + g
   Ke = $4.3995/$50(1-0.15) + 0.05
   Ke = $4.3995/$42.50 + 0.05
  Ke = 0.1535 = 15.35%
 WACC = Wdrd(1 – T)  + Wprp + Were
WACC = 0.3(7.72)(1-0.4) + 0.1(9) + 0.6(15.35)
WACC = 1.39 + 0.9 + 9.15
WACC = 11.44%                    
Explanation:
In this case, we need to calculate cost of debt, cost of preference shares and cost of equity. Cost of debt is calculated based on internal rate of return. Cost of preferred stock is the ratio of dividend paid to the market price. Cost of equity is a function of D1 divided by current market price after floatation cost plus growth rate. WACC is equal to cost of each source multiplied by respective weights.