Stock A has a beta of $1\mathrm{.}15$ and an expected return of $10\mathrm{.}4$ percent. A risk$-$free asset currently earns $3\mathrm{.}8$ percent. $$ Beta E$($R $)$ Stock A $1\mathrm{.}1510\mathrm{.}40\%$ Risk$-$free asse $0\mathrm{.}03\mathrm{.}80\%$ What is the expected return on a portfolio that is equally invested in the two assets? $(5$ points$)$ If a portfolio of the two assets has a beta of $\mathrm{.}7,$ what are the portfolio weights? $(5$ points$)$ If a portfolio of the two assets has an expected return of $9$ percent, what is its beta? $(5$ points$)$excel