Chapter 4.2, Problem 23E

In Problems 13-24, solve the following linear programming problems. Restrict $x\ge 0$

and $y\ge 0$.

Minimize $g=40x+25y$ subject to

$\begin{array}{l}x+y\ge 100\\ -x+y\le 20\\ -2x+3y\ge 30\end{array}$