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CHAPTER 6:
MANAGING
INVENTORY
Inventory Management
Objective:
1. Maximize inventory turnover
2. Carry sufficient inventories

EXCESSIVE
Heavy burden on cash

INSUFFICIENT
Lost sales, delay for
customers
Terms:
Lead Time
- Time between start of activity, process and
completion (Start till the end process).
Stock Out
- Production require the inventory, but stores out of
the inventory (Out of stocks).
Buffer
- Maintaining the inventory and WIP for any
interruption of supply.
Re-order Quantity
- Number of units in one order.

Re-order Level
- Level of inventory, when should place an order.
Economic Order Quantity
- Replenishment order size, minimize ordering
costs and holding costs.
Types of Inventory
1. Raw Materials
- Mostly on credit or Accounts Payables
2. Work In Progress (WIP)
- Consist partially finished goods.
- Need add work before become finished goods.
3. Finished Goods
- Product completed but not sold yet.
Costs of Inventory
There are three other inventory costs:

1. Holding costs
- Admin, staff costs, insurance & etc.
2. Order set up costs
- Incurred each time a batch of inventory is ordered.
3. Stock out costs
- Costs of running out inventory.
4. Purchase costs
- Actual cost of buying inventory
Economic Order Quantity
Model (EOQ)
Definition:
1. Tools to determine the optimal order quantity

that results in the lowest total in inventory cost.
2. Optimal order level will lead to minimal overall
inventory cost.
EOQ

Conflict among
dept:
- Financial dept:
low lvl of
inventory
- Marketing dept:
high lvl of
inventory
- Production Dept:
High lvl of
inventory

More frequent –
increase ordering cost,
decrease holding cost
Less frequent –
decrease ordering cost,
increase holding cost
EOQ Formula
Example
Annual demand – 30,000 barrels.
Purchase in lot 5,000 barrels.
Price is $12/each.
Ordering cost is $200/per order.
Holding cost is 10% of purchase price.
Calculate the total cost by using EOQ and without
EOQ technique?
Without EOQ
Total Cost

= Holding Cost + Ordering Cost
= (Average Inventory x Ch/unit) +
(No. of orders x Co/order)
= (Q/2 x Ch) + (D/2 x Co)
= (5,000/2 x 1.20) +
(30,000/5,000 x 200)
= $ 3,000 + 1,200
= $ 4,200
C6 managing inventory

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C6 managing inventory

  • 2. Inventory Management Objective: 1. Maximize inventory turnover 2. Carry sufficient inventories EXCESSIVE Heavy burden on cash INSUFFICIENT Lost sales, delay for customers
  • 3. Terms: Lead Time - Time between start of activity, process and completion (Start till the end process). Stock Out - Production require the inventory, but stores out of the inventory (Out of stocks). Buffer - Maintaining the inventory and WIP for any interruption of supply.
  • 4. Re-order Quantity - Number of units in one order. Re-order Level - Level of inventory, when should place an order. Economic Order Quantity - Replenishment order size, minimize ordering costs and holding costs.
  • 5. Types of Inventory 1. Raw Materials - Mostly on credit or Accounts Payables 2. Work In Progress (WIP) - Consist partially finished goods. - Need add work before become finished goods. 3. Finished Goods - Product completed but not sold yet.
  • 6. Costs of Inventory There are three other inventory costs: 1. Holding costs - Admin, staff costs, insurance & etc. 2. Order set up costs - Incurred each time a batch of inventory is ordered. 3. Stock out costs - Costs of running out inventory. 4. Purchase costs - Actual cost of buying inventory
  • 7. Economic Order Quantity Model (EOQ) Definition: 1. Tools to determine the optimal order quantity that results in the lowest total in inventory cost. 2. Optimal order level will lead to minimal overall inventory cost.
  • 8. EOQ Conflict among dept: - Financial dept: low lvl of inventory - Marketing dept: high lvl of inventory - Production Dept: High lvl of inventory More frequent – increase ordering cost, decrease holding cost Less frequent – decrease ordering cost, increase holding cost
  • 10. Example Annual demand – 30,000 barrels. Purchase in lot 5,000 barrels. Price is $12/each. Ordering cost is $200/per order. Holding cost is 10% of purchase price. Calculate the total cost by using EOQ and without EOQ technique?
  • 11. Without EOQ Total Cost = Holding Cost + Ordering Cost = (Average Inventory x Ch/unit) + (No. of orders x Co/order) = (Q/2 x Ch) + (D/2 x Co) = (5,000/2 x 1.20) + (30,000/5,000 x 200) = $ 3,000 + 1,200 = $ 4,200