Q4) Consider the following L.P model: Max Z-2X, +4X S.T. X + 2X X + X X, X 20 The following is the optimal solution, Basic X S X 0 1/2 1/2 55 54 X 0 1 0 S 2 1/2 -1/2 S 0 0 1 Solution 10 5/2 3/2 (a). - Determine the status of each resource. (b) - Determine the unit worth of each resource. (c) Determine the maximum range of change in the availability of the first resource that will keep the current solution feasible. (d)- In part (c) determine the associated change in the optimal value of Z. (e)- Find an alternative optimal solution for this