ITPEC IP October 2020 Question 70
One (1) piece of Product P consists of two (2) pieces of Part Q, and Part Q consists of four (4) pieces of Part R. When there is one (1) piece of Part Q and there are three (3) pieces of Part R in the inventory, how many more pieces of Part R are needed to produce six (6) pieces of Product P?
Explanation
41 pieces — explode the requirement level by level and subtract the stock at each level before going down to the next.
- •Part Q needed: 6 × 2 = 12; 1 in stock, so make 12 − 1 = 11
- •Part R for those: 11 × 4 = 44; 3 in stock
- •Part R still needed: 44 − 3 = 41
Answer (a)
Why not others:
- •(b) 44 — subtracts the stock of Q but forgets the 3 pieces of R in stock
- •(c) 45 — subtracts the stock of R but forgets the piece of Q in stock, 12 × 4 − 3
- •(d) 48 — the gross requirement, 6 × 2 × 4, ignoring both stocks
Key rule: In MRP, net requirement = gross requirement − stock of the same item, and a parent's net requirement (not its gross) is what drives the next level down.
Business Industry · AI-written, may contain errors
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