Final answer:
According to Modigliani and Miller proposition II with taxes, the cost of equity of a company is calculated by adding the cost of debt multiplied by (1 - tax rate) to the cost of equity if the company had no debt.
Step-by-step explanation:
According to Modigliani and Miller proposition II with taxes, the cost of equity of the company is calculated by adding the cost of debt multiplied by (1 - tax rate) to the cost of equity if the company had no debt. In this case, the cost of equity if the company had no debt is 8%. The cost of debt is 6.5% and the tax rate is 20%. Therefore, the cost of equity of the company is:
8% + (6.5% * (1 - 0.20)) = 8% + (6.5% * 0.80) = 8% + 5.2% = 13.2%
Therefore, the closest option to the cost of equity of the company according to Modigliani and Miller proposition II with taxes is 13.2%, which is not listed in the given answer choices.