Here is some information about Stokenchurch Incorporated: Beta of common stock =2.0 Treasury bill rate =4% Market risk premium =7.3% Yield to maturity on long-term debt =10% Book value of equity =$420 million Market value of equity =$840 million Long-term debt outstanding =$840 million Corporate tax rate =21% What is the company's WACC? Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places