There are five corner points in the feasible region for the product mix problem. We identified the coordinates of one of them: (560, 1200). Identify the coordinates of the others.
a. Only one of these other corner points has positive values for both changing cells. Discuss the changes in the selling prices of either or both models that would be necessary to make this corner point optimal.
b. Two of the other corner points have one changing cell value positive and the other zero. Discuss the changes in the selling prices of either or both models that would be necessary to make either of these corner points optimal.