Answer:
11.25%
Explanation:
We use modigliani-miller proposition with taxes
Value unlevered: EBIT x (1 - tax-rate) / cost of equity
35,000 x (1 - 0.21) / 0.109 = 260.091,74
Value levered firm: unlevered + debt x tax-rate
260,091 + 35,000 x 0.21 = 267,441
Equity(levered firm): 267,441 - 35,000 = 232,441
Return on equity:
unlevered + difference between firm return and debt cost x weight of debt x after tax
0.109 + (10.9-0.08) x 35,000/232,441 x (1 - 0.21) = 0.112537027 = 11.25%