
Answer:
the firm's WACC is 10.29 %.
Explanation:
Weighted Average Cost of Capital (WACC) is the weighted return required by all providers of Permanent Sources of Capital to the firm.
WACC = ke × (e/v) + kp × (p/v) + kd × (d/v)
ke = cost of equity
  = 17%
e/v = weight of equity
   = 0.41
kp = cost of preference stocks
  = 6.50 %
p/v = weight of preference stocks
   = 0.04
kd = cost of debt
  = interest × ( 1 - tax rate)
  = 8.30 % × ( 1 - 0.33)
  = 5.561 %
d/v = weight of debt
   = 0.55
Therefore,
WACC =  17% × 0.41 + 6.50 % × 0.04 + 5.561 %× 0.55
      =  10.29 %