What rate of return should be required on the Vodafone share, which has a of 0.7,

What rate of return should be required on the Vodafone share, which has a β of 0.7, if the Rio Tinto share, which has a β of 1.1, returns 8%

and is correctly valued, and the rate of a risk-free asset is 0.5%?

AppendixLO1