As a resource manager of the Delta Sound project, you are preparing the material requirement plan (MRP) for a product S (subassembly) for the next 8 weeks. The demand for the subassembly S is 100 units in week 6, and 100 units in week 7. Each unit of S requires 1 unit of T, and 2 units of U. Each unit of T requires 1 unit of V, and 2 units of W. Finally, each unit of U requires 2 units of Y, and 3 units of Z. One firm manufactures all items. It takes 1 weeks to make S, 1 week to make T, 2 weeks to make U, 2 weeks to make V, 3 weeks to make W, 1 weeks to make Y, and 0 week to make Z.

1. Develop a product structure (Bill of Material). Identify all levels, parents and components.
2. Construct a 'Material requirements plan (MRP)' by using the following on-hand inventory, quantity multiple, and safety stock provision exhibiting in Table 1:

Item	On-hand inventory	Quantity multiple	Safety Stock	Schedule receive
S	20	Lot for lot	0
T	20	Lot for lot	0
U	40	50	0	50 in week 2
V	30	Lot for lot	10
W	30	15	0
Y	140	200	20	100 in week 1
Z	40	Lot for lot	0