Here is some information about Stokenchurch Incorporated:

Beta of common stock $=20$

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?

Note: Do not round intermediate calculations. Enter your answer as a percent rounded to $2$ decimal places.

WACC $\%$