OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
7th Edition
ISBN: 9780077835439
Author: Roger G Schroeder, M. Johnny Rungtusanatham, Susan Meyer Goldstein
Publisher: McGraw-Hill Education
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Chapter 14, Problem 11P

The Suregrip Tire Company carries a certain type of tire with the following characteristics:

Average annual sales = 600 tires

Ordering cost = $40 per order

Carrying cost = 25 percent per year

Item cost = $50 per tire

Lead time = 4 days

Standard deviation of daily demand = 1 tire

  1. a. Calculate the EOQ.
  2. b. For a Q system of inventory control, calculate the safety stock required for service levels of 85, 90, 95, 97, and 99 percent.
  3. c. Construct a plot of total inventory investment versus service level.
  4. d. What service level would you establish on the basis of the graph in part c? Discuss.
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A pharmacist is trying to determine the inventory order and stock levels for a particular drug. The following information is available about the drug. Demand (D) 85 tablets/week Working weeks per year 52 weeks Unit holding cost per year (H) $6 Order cost (S) $44/order Standard deviation of weekly demand (sd) 15 tablets Lead time (L) 2 weeks Desired cycle service level 95% If the pharmacist uses the continuous review (Q) system to control the inventory of the drug, what would be the order quantity and reorder point? If the pharmacist uses the periodic review (P) system to control the inventory of the drug, what would be the review interval and target inventory level? (Hint: Use the EOQ model to derive the review interval P)
The Always Fresh Grocery Store carries a particular brand of tea that has the following characteristics:Sales = 8 cases per week Ordering cost = $10 per order Carrying charge = 20 percent per year Item cost = $80 per casea. How many cases should be ordered at a time?b. How often will tea be ordered?c. What is the annual cost of ordering and carrying tea?d. What factors might cause the firm to order a larger or smaller amount than the EOQ?
As the Manager of Branson’s Department Store, you are responsible for ensuring that reorder quantities for the various items have been correctly established. You decide to test one item and choose product Z. A continuous review inventory policy has been used, so you examine this as well as other records and come up with the following data:   Cost per unit $35 Holding cost 20 percent of unit cost Average daily demand 10 units Ordering cost $30 per order Standard deviation of daily demand 3 units Delivery lead time 4 days   Because customers generally do not wait but go elsewhere, you decide on a service probability of 90 percent. Assume that Branson’s Department Store operates 320 days per year. [What is the annual demand (D)? Determine the optimal order quantity, Q*. Determine the reorder point (R) if demand is constant. Determine the reorder point (R) if demand is varies.

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OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)

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