Answer:
Option (C) is correct.
Explanation:
We have to use MM proposition that cost of equity will change itself in such a manner so that it can take care of its debt.
Cost of equity:
= WACC of all equity firm + (WACC of all equity - Cost of debt ) × (Debt -to-equity ratio)
At the beginning, when there was no debt,
WACC = cost of equity = 12 %
Levered cost of equity:
= 12% + ( 12% - 6%) × 0.5
= 15%
Therefore, Rearden's levered cost of equity would be closest to 15%.