Answer:
A. 8.19%
Explanation:
D 250
E 550
V 800
[tex]WACC = K_e(\frac{E}{E+D}) + K_d(1-t)(\frac{D}{E+D})[/tex]
Ke 0.1
Equity weight 0.6875 (550/800)
Kd 0.07
Debt Weight 0.3125 (250/800)
t 0.4
[tex]WACC = 0.1(0.6875) + 0.07(1-0.4)(0.3125)[/tex]
WACC 8.18750% = 8.19
The taxes doesn't affect the cost of equity. The equity doesn't provide a tax shield like debt. Taxes don't decrease the cost of equity.