Q$.3$ Set. $($B$)$ A bill of materials with lead time $($in weeks$),$ on$-$hand quantities, lot sizes and scheduled receipts

for product A are shown below

Numbers within $()$ denotes the number of corresponding items required for one parent item.

Construct BOM tree with structure and for a requirement of $60$ units, $120$ units of A in week $7$ and

week $8$ respectively prepare a MRP