CCR Events, Co. has a current capital structure that is 70% equity, 20% debt, and 10% preferred stock. Out of the total equity portion, 40% comes from new retained earnings to finance this project. Also, CCR has estimated the following:

After-tax cost of debt: 7.0%

Cost of preferred stock: 8.0%

Cost of internal equity: 13.0%

Cost of external equity: 15.0%

Based on CCRs capital allocation and optimal capital structure, what should CCRs WACC for this project?