What is the reorder point formula in inventory management?
Correct Answer
D) (Average daily usage × Lead time) + Safety stock
The reorder point formula is (Average daily usage × Lead time in days) + Safety stock. This ensures materials are reordered before running out, accounting for delivery time and demand variability.
Why This Is the Correct Answer
Option D is correct because the reorder point formula must account for both the expected usage during lead time AND additional safety stock for unexpected delays or increased demand. The formula (Average daily usage × Lead time) calculates the minimum inventory needed during the ordering period, while adding safety stock provides a buffer against variability. This complete formula ensures contractors never run out of critical materials during construction projects.
Why the Other Options Are Wrong
Option A: Average daily usage × Lead time in days
Option A only calculates the expected usage during lead time but fails to include safety stock, which is essential for protecting against supply delays or unexpected demand increases that commonly occur in construction projects.
Option B: Economic Order Quantity ÷ 2
Option B describes the average inventory level in the Economic Order Quantity model, not the reorder point. EOQ ÷ 2 tells you average stock on hand but doesn't indicate when to place new orders.
Option C: Safety stock + Average demand
Option C is incomplete because it includes safety stock but fails to account for the materials that will be consumed during the lead time period while waiting for the new order to arrive.
Memory Technique
Remember 'ROP = USE + SAFE' where USE is what you'll consume during lead time (usage × lead time) and SAFE is your safety stock buffer.
Reference Hint
Look up 'Inventory Management' or 'Materials Management' sections in construction management references, typically found in project management or business operations chapters.
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