Alberta Inc. has a target capital structure of 0.40 debt, 0.10 preferred stock, and 0.50 common equity.

The company's cost of debt is 6%, its cost of preferred stock is 9%, its cost of its cost of common equity is 15%. What is the company's cost of capital?

Round to the nearest "0.1%". Enter your answer as a percentage. For example, if your answer is "2.5%", enter "2.5".