The calculation of CAPM requires a risk free rate of return (return of 3 month US T-bill) and a market return ( S & P 500). As I understand it the calculation to find the expected return = risk free return + beta of company(market return-risk free rate of return). I do not know how to find neither the return of the 3 month U.S. T-bill nor the return of the S & P 500. Can you please advise where I find the return of these two items so I can calculate my expected rate of return? Thank you!