Lightning Trains would like to invest into new technology high-speed trains, and this new project which will be as risky as the company's current projects. For this new project, the company plans to raise money by selling new common stock shares and new debt, with the debt-to-equity ratio of 0.37. The annual costs of common stock and debt equal 10% and 4%, respectively. Lightning Trains falls into 33% corporate income tax bracket. Calculate Lightning Trains' average annual cost of running its train business, also known as the Weighted Average Cost of Capital. Your answer should be in %, not in decimals: e.g., 10.23 rather than 0.1023.