Here is some information about Stokenchurch Incorporated:

Beta of common stock $=2\mathrm{.}0$

Treasury bill rate $=4\%$

Market risk premium $=7\mathrm{.}3\%$

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?