Consider the following linear programming formulation.

Maximize $z=10x_1+20x_2$

subject $to$

$2x_1+2x_{2}100$

$2x_{2}300$

$4x_1+60$

$x_1+x_{2}200$

$x_1,50$

$x_1,x_{2}0$

Formulate and solve this problem in Excel.

What is the slack associated with the constraint $2x_1+2x_{2}100?$