Production and Operations Analysis, Seventh Edition
Production and Operations Analysis, Seventh Edition
7th Edition
ISBN: 9781478623069
Author: Steven Nahmias, Tava Lennon Olsen
Publisher: Waveland Press, Inc.
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Chapter 4.5, Problem 13P
Summary Introduction

To determine:

Error in calculating average cost when set up cost was $15.

Introduction:

Holding cost is the cost incurred when goods are kept in warehouses without sale.

Setup cost is the fixed cost which is incurred for production process.

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Chicago’s Treadway Tires Dealer must order tires fromits national warehouse. It costs $10,000 to place an orderand $400 to review the inventory level. Annual tire sales are N(20,000, 4,000,000). It costs $10 per year to hold a tire ininventory, and each order arrives two weeks after beingplaced (52 weeks 1 year). Assume that all shortages arebacklogged.a Estimate R and the number of orders per year thatshould be placed.b Using the answer in part (a), determine the optimal(R, S) inventory policy. Assume that the shortage cost is$100 per tire.
AV City (Problem 13-1) assumed with certainty that the or-dering cost is $625/order and the inventory carrying cost is $130/unit/year. However, the inventory model parametersare frequently only estimates that are subject to somedegree of uncertainty. Consider four cases of variation inthe model parameters as follows: (a) Both ordering costand carrying cost are 10% less than originally estimated;(b) both ordering cost and carrying cost are 10% higherthan originally estimated; (c) ordering cost is 10% higherand carrying cost is 10% lower than originally estimated;and (d) ordering cost is 10% lower and carrying cost is 10% higher than originally estimated. Determine the opti-mal order quantity and total inventory cost for each of the four cases. Prepare a table with values from all four casesand compare the sensitivity of the model solution tochanges in parameter values.
At sejahtera.com, a large retailer of popular books, demand is constant at 32,000 books per year. The cost of placing an order to replenish stock is $10, and the annual cost of holding is $4 per book. Stock is received five working days after an order has been placed. The backordering is not allowed. Assume 300 working days a year. a.    calculate sejahtera.com’s optimal order quantity. b.    calculate the optimal number of orders per year  c.    Calculate the optimal interval (in working days) between orders. d.    Determine the demand during the lead time. e.    Determine the reorder point. f.    Determine the inventory position immediately after an order has been placed. g.    Draw the model to represent the case.
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