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Q.2 (30 marks) Consider the following LP problem: MAX Z 4x + 2x2 + 9x3 + 3x4 Subject to: 4x1 + 2x2 + x3 + X4 3x1 + x2 + X3 + 2x4 8 0, X2 > 0,X3 20, X4 20 After one or more iterations of the Simplex method, x2 and x4 became the basic variables, and following matrix was identified as the inverse of the current Basis matrix B: B = 1 -1 ] 2 a) Use the concepts of Revised Simplex method to determine the Augmented Solution and its Objective Function value at this iteration. Show complete working. (10 marks) (20 marks) b) Evaluate whether the current solution is optimal or not. Show complete working