What is the Beta of a portfolio with an expected return of 12% if Treasury bills yield 6% and the market risk premium is 8%? 

Determine the expected return of a company's stock given a risk free rate of 7%, an expected market return of 12%, a market risk premium of 5% and a company Beta of 1.5.    

An investor divides her portfolio into thirds, with one part in Treasury bills, one part in a market index, and one part in a diversified portfolio with Beta of 1.50. 

What is the Beta of the investor's overall portfolio?