Product Z is made from three units of A$,$ two of B$,$ and four of C$.$ A$,$ in turn, is made of one unit of C and five of D$.$ A customer order was received for $200$ units of Z in Week $8.($Hint: You will need to use $$low$-$level coding$,$ i$.$e$.,$ pull each item to the lowest level it appears on the BOM.$)$

Item Lot Size On Hand Lead Time

Z LFL $303$

A LFL $401$

B LFL $1004$

C $1000503$

D $50020003$

a$.$ Show the Bill of Materials

b$.$ Develop MRP schedules showing gross$/$net requirements and planned order releases$/$receipts for each item.