Security A has an expected return of $12\mathrm{.}4$ percent with a standard deviation of $15$ percent, and a correlation with the market of $0\mathrm{.}85.$ The standard deviation of rM is $12$ percent.

What is the beta coefficients of A$?$ If the risk$-$free rate is $6$ percent, what is the value of rM$?[$Hint: Beta$=$Cov$($Ri$,$Rm$)/$Var$($Rm$)]$