Stock A has expected return of $15\%$ and standard deviation of $20\%.$ Stock B has expected return $20\%$ and standard deviation of $15\%.$ The two stocks have a correlation coefficient of $0\mathrm{.}5.$The beta of stock A is $1$ and the beta of stock B is $1\mathrm{.}5.$ What is the risk premium on the market portfolio? What is the risk free rate in the economy?