Problem 2 (8 points) The demand for product S is 150 units at the start of week 6. Each product S needs 2 T units and 3 U units. Each T unit needs 2 V units, 1 W unit, and 4 X units. Each U unit needs 3 Y units and 1 X. One company manufactures all the items. The delivery time of S is 1 week, T is 2 weeks, U is 2 weeks, V is 2 weeks, W is 3 weeks, X is 1 week, and Y is 2 weeks. a) Trace the structure of the product with the lowest level coding. b) Plot the time horizon graph covering the cumulative production time and structure of the product. c) Taking into account the stock on hand, write a PBM/MRP according to a lot-for-lot policy.

d) In addition to 150 units of S at the start of week 6, there is a demand for 50 units of U, which is a component of S. The 50 units are required for maintenance. These 50 units must ship at the start of week 4. Revise your PBM/MRP accordingly for this change. e) Is there a feasible solution in part d)? Justify your answer. If there is no workable solution, give a recommendation on how it can be made workable.

Article Stock en main STUY V W X Y 30 40 20 30 250 50 80