WACC. Here is some information about Stokenchurch Inc.:

Beta of common stock $=1\mathrm{.}2$

Treasury bill rate $=4\%$

Market risk premium $=7\mathrm{.}5\%$

Yield to maturity on long$-$term debt $=6\%$

Book value of equity $=$$$440$ million

Market value of equity $$$880$ million

Long$-$term debt outstanding $=$$$880$ million

Corporate tax rate $=21\%$

What is the company's WACC? $($L$013-1)$