Question (4) [6 marks Consider the following optimal tableau, where SS2, and S, are slack variables added to the original problem: 80 120 90 0 0 0 120 90 X, 1 X, 0 S, 0 SOLUTION Mix X, X S, 2 C-2 0 * -1.5 3.5 -1.0 135 -55 0 0.125 -0.125 0 3.75 1 0 90 QUANTITY 37.5 12.5 10.0 5.625 -0.75 1.25 -0.5 22.5 -22.5 0 1 0 120 0 0 0 -3.75 0 1. Identify the values of basic variables, non basic variables, and the value of objective function? 2. What is the range over which the coefficient of X, can vary without changing the optimal basis? 3. What is the range of insignificance of the contribution rate of the variable