Operations and Supply Chain Management 9th edition
9th Edition
ISBN: 9781119320975
Author: Roberta S. Russell, Bernard W. Taylor III
Publisher: WILEY
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Chapter 9, Problem 9P
In one of the little-known battles of the Civil War, General Tecumseh Beauregard lost the Third Battle of Bull Run because his preparations were not complete when the enemy attacked. If the critical path method had been available, the general could have planned better. Suppose that the project network below with activity times in days had been available. Determine the earliest start and finish times, latest start and finish times, and activity slack for the network. Indicate the critical path and the time between the general’s receipt of battle orders and the onset of battle.
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Sam's Pet Hotel operates 51 weeks per year, 6 days per week, and uses a continuous review inventory system. It purchases kitty litter for $11.00 per bag.
The following information is available about these bags:
> Demand
95 bags/week
> Order cost $52.00/order
> Annual holding cost = 25 percent of cost
> Desired cycle-service level = 80 percent
>Lead time 4 weeks (24 working days)
> Standard deviation of weekly demand = 15 bags
> Current on-hand inventory is 320 bags, with no open orders or backorders.
a. Suppose that the weekly demand forecast of 95 bags is incorrect and actual demand averages only 75 bags per week. How much higher will total
costs be, owing to the distorted EOQ caused by this forecast error?
The costs will be $
higher owing to the error in EOQ. (Enter your response rounded to two decimal places.)
Sam's Pet Hotel operates 50 weeks per year, 6 days per week, and uses a continuous review inventory system. It purchases kitty litter for $10.50 per bag.
The following information is available about these bags:
> Demand = 95 bags/week
> Order cost = $55.00/order
> Annual holding cost = 35 percent of cost
> Desired cycle-service level = 80 percent
> Lead time = 4 weeks (24 working days)
> Standard deviation of weekly demand = 15 bags
> Current on-hand inventory is 320 bags, with no open orders or backorders.
a. Suppose that the weekly demand forecast of 95 bags is incorrect and actual demand averages only 75 bags per week. How much higher will total
costs be, owing to the distorted EOQ caused by this forecast error?
The costs will be $ 10.64 higher owing to the error in EOQ. (Enter your response rounded to two decimal places.)
b. Suppose that actual demand is 75 bags but that ordering costs are cut to only $13.00 by using the internet to automate order placing. However, the buyer
does…
Chapter 9 Solutions
Operations and Supply Chain Management 9th edition
Ch. 9 - Why is CPM/PERT a popular and widely applied...Ch. 9 - What is the purpose of a CPM/PERT network?Ch. 9 - Why are dummy activities used in a CPM/PERT...Ch. 9 - What is the critical path, and what is its...Ch. 9 - What is slack, and how is it computed?Ch. 9 - How are the mean activity times and activity...Ch. 9 - How is total project variance determined in...Ch. 9 - What is the purpose of project crashing analysis?Ch. 9 - Describe the process of manually crashing a...Ch. 9 - Which method for determining activity time...
Ch. 9 - Explain how a Gantt chart differs from a CPM/PERT...Ch. 9 - Discuss the relationship of direct and indirect...Ch. 9 - Describe the limitations and disadvantages of...Ch. 9 - Describe the difference between activity-on-node...Ch. 9 - Identify and briefly describe the major elements...Ch. 9 - Select an everyday project you are familiar with...Ch. 9 - Prepare a WBS for a spaghetti with meatballs...Ch. 9 - Construct a Gantt chart for the project described...Ch. 9 - Construct a Gantt chart for the project described...Ch. 9 - Use the project activities that follow to...Ch. 9 - Construct a network from the information in the...Ch. 9 - For the network in Problem 9.4, determine the...Ch. 9 - Given the following network with activity times in...Ch. 9 - Given the following network with activity times in...Ch. 9 - A marketing firm is planning to conduct a survey...Ch. 9 - In one of the little-known battles of the Civil...Ch. 9 - A group of developers is building a new shopping...Ch. 9 - The management of a factory is going to erect a...Ch. 9 - Given the following network and probabilistic...Ch. 9 - The Farmers American Bank of Leesburg is planning...
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