mix that will enable her to obtain a total return of at least $9\%.$

percentage $($as a decimal$)$ of funds invested in the bond fund and $S$ is the percentage $($as a decimal$)$ of funds invested in the stock fund.$)$

Max $($as a decimal$)$

s$.$t$.$

bond minimum fund

minimum return

percentage requirement

$B,S0$

$($b$)$ Solve the problem using the graphical solution procedure. What is the value of the objective function at the optimal solution?

$at(B,S)=1,$