Final answer:
Williamson's unlevered cost of equity capital is approximately 9.53%.
Step-by-step explanation:
To calculate Williamson's unlevered cost of equity capital, we need to use the formula:
Unlevered Cost of Equity = Cost of Capital - ((Debt/Equity) x (1 - Tax Rate))
Given that Williamson has a debt-equity ratio of 2.5, and a pre-tax cost of debt of 6%, we can substitute the values into the formula:
Unlevered Cost of Equity = 10% - ((2.5/(1+2.5)) x (1-0.35))
Simplifying the expression, we get:
Unlevered Cost of Equity = 10% - (2.5/3.5) x 0.65
Unlevered Cost of Equity = 10% - 0.4643
Therefore, Williamson's unlevered cost of equity capital is approximately 9.53%.