Answer:
14.50%
Explanation:
Proportion of debt the firm uses = $200 / $200 + $600 = 0.25
Proportion of equity the firm uses = 1 - 0.25 = 0.75
WACC = proportion of debt x cost of debt x (1 - tax rate) + proportion of equity x cost of equity
cost of equity = risk free rate + (beta x market risk premium)
2% + (1.25 x 12%) = 17%
0.25 x 10% x (1 - 0.30) + 0.75 x 17%
1.75 + 12.75% = 14.50%