Omega Corporation has 10 million shares outstanding, now trading at $55 per share. The firm has estimated the expected rate of return to shareholders at about 12%, It has also issued long-term bonds at an interest rate of 7% and has a debt value of $200million. It pays tax at a makginal rate of 21%. What is Omega's after-tax WACC? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)