Here is some information about Stokenchurch Inc.: 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 companys WACC? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)