Huruma Ltd. is a client of ABX National Bank. The Managing Director of Huruma Ltd. visited the bank’s offices to
seek for an additional line of credit. In the ensuing discussions, the bank credit officer noticed that Huruma Ltd. could
save a substantial amount of money by improving on its inventory management.
The credit officer invited the Management Accountant of the company for further consultation. From the conversation,
it emerged that the company holds a substantial quantity of a particular raw material in its warehouse. The Management
Accountant provided the following information on the raw material:
| Invoice cost per unit | Sh.1,200 |
| Shipping charges | Sh.25 per unit plus Sh.140,000 per shipment |
| Inventory insurance | Sh.10 per unit per year |
| Annual handling and inspection cost of the raw material: | |
| Warehouse utilities | |
| Warehouse rental | Sh.26 per unit plus Sh.150,000 per year |
| Unloading costs for units received (paid to shipper) | Sh.9,800 per month |
| Receiving supervisor’s salary: | Sh.115,000 per month |
| Processing invoices and other purchase documents | |
| Sh.8 per unit |
| Sh.176,000 per month |
| Sh.1,860 per order. |
The company’s policy is to order 5,000 units each time and maintain a safety stock of 3,000 units. The annual demand
for the raw material is 45,000 units. The lead time for an order is 10 working days.
The Management Accountant has also indicated that if there is a stock-out, it would be necessary to obtain the raw
material by a special courier service at an additional cost of Sh.81,000 per stock-out.
The probabilities of a stock-out at various safety stock levels were given as follows:
| Safety stock (units) | Probability for stock-out |
| 500 | 0.25 |
| 1,000 | 0.08 |
| 1,500 | 0.02 |
| 2,000 | 0.01 |
Additional information:
1. The company’s cost of capital is 10%.
2. You are advised that there are 250 working days in a year.
3. The raw material is ordered in multiples of 250 units.
4. For analysis purposes, a stock-out probability of 0.02 would be reasonable for order cost determination in an
optimal inventory policy.
Required:
(a) The annual cost of the company’s present inventory policy.
(b) Recommend an optimal order quantity for the company based on the information provided.
(c) Recommend an optimal safety stock level.
(d) Advise the management of the firm on the savings to be realised from the optimal order quantity and optimal
safety stock level in (b) and (c) above.
(e) The reorder level for the company.
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