ANT Infra orders two kinds of precast items: A and B for use in its projects  from two different suppliers. The precasts are needed throughout the entire  52-week year. Precast A are used at a relatively constant rate and are  ordered whenever the remaining quantity drops to the reorder level. While,  precast B is ordered from a supplier who delivers by every three weeks.  Data for both precast items are as follows: Item  Precast A  Precast B Annual demand 10,000 5,000 Holding cost (% of item  cost) 20% 20% Order cost $150   $25 Lead time 4 weeks  1 week Safety stock 55 units  5 units Item cost $10.00  $2.00 a. Employ Q system for precast A and calculate the EOQ, the reorder  point, total inventory cost?  b. Employ P system for precast B and estimate the target level inventory  and total inventory cost?

Purchasing and Supply Chain Management
6th Edition
ISBN:9781285869681
Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson
Publisher:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. Patterson
Chapter16: Lean Supply Chain Management
Section: Chapter Questions
Problem 10DQ: The chapter presented various approaches for the control of inventory investment. Discuss three...
Question

ANT Infra orders two kinds of precast items: A and B for use in its projects 
from two different suppliers. The precasts are needed throughout the entire 
52-week year. Precast A are used at a relatively constant rate and are 
ordered whenever the remaining quantity drops to the reorder level. While, 
precast B is ordered from a supplier who delivers by every three weeks. 
Data for both precast items are as follows:
Item  Precast A  Precast B
Annual demand 10,000 5,000
Holding cost (% of item 
cost)
20% 20%
Order cost $150   $25
Lead time 4 weeks  1 week
Safety stock 55 units  5 units
Item cost $10.00  $2.00

a. Employ Q system for precast A and calculate the EOQ, the reorder 
point, total inventory cost? 

b. Employ P system for precast B and estimate the target level inventory 
and total inventory cost?

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