Question 1a: (20 pts) Solve the following linear programming model graphically. Interpret the change in the optimal point, if the objective function coefficient of decreases to 2 . Question 1b: (15 pts) The excel solution of the mathematical model represented in part a is given in the following table. Please fill the missing parts (shown with ?) of the table. Question 1a: (20 pts) Solve the following linear programming model graphically. maxZ=4x1+3x2subjectto6x1+8x25203x1+2x2190x150x250x1x20 Interpret the change in the optimal point if the objective function coefficient of x1 decreases to 2 Question 1b: (15 pts) The excel solution of the mathematical model represented in part a is given in the following table. Please fill the missing parts (shown with ?) of the table..