Operations Management (McGraw-Hill Series in Operations and Decision Sciences)
12th Edition
ISBN: 9780078024108
Author: William J Stevenson
Publisher: McGraw-Hill Education
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Chapter 11, Problem 9P
Wormwood, Ltd., produces a variety of furniture products. The planning committee wants to prepare an aggregate plan for the next six months using the following information.
Subcontracting can handle a maximum of 10 units per month. Beginning inventory is zero. Develop a plan that minimizes total cost. No back orders are allowed. Regular capacity = Regular production.
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WSS company makes weatherproof surveillance systems for parking lots. Demand estimates for the next four quarters are 25, 9, 13, and 17 units. Prepare an aggregate plan that uses inventory, regular time and overtime and back orders. Subcontracting is not allowed. Regular time capacity is 15 units for quarters 1 and 2, 18 units for quarters 3 and 4. Overtime capacity is 3 units per quarter. Regular time cost is $2000 per unit, while overtime cost is $3000 per unit. Back order cost is $300 per unit per quarter; inventory holding cost is $100 per unit per quarter. Beginning inventory is zero.
Questions
At the end of quarter 3, what is the ending inventory of finished systems? Answer: No ending Inventory =0
What is the total cost? 15*2000 + 6*2300 +4*2600 + 9*2000 + 13*2000 + 17*2000 =$132, 200
What is the average cost per unit? Answer 132200 / 64 = $2,066.
WSS company makes weatherproof surveillance systems for parking lots. Demand estimates for the next four quarters are 25, 9, 13, and 17 units. Prepare an aggregate plan that uses inventory, regular time, and over time, and backorders. Subcontracting is not allowed. The regular time capacity is 15 units for quarters 1 and 2, 18 units for quarters 3 and 4. Overtime capacity is 3 units per quarter. The regular time cost is $2000 per unit, while the overtime cost is $3000 per unit. Backorder costs $300 per unit per quarter; inventory holding costs $100 per unit per quarter. The beginning inventory is zero.
How many total units will be produced in quarter 1 for delivery in quarter 1?
How many units in total will be used to fill back orders over the four quarters?
What is the cost to produce one unit in Quarter 4 using overtime to fill a back order in quarter one?
The president of Hill Enterprises, Terri Hill, projectsthe firm’s aggregate demand requirements over the next 8 monthsas follows:Jan. 1,400 May 2,200Feb. 1,600 June 2,200Mar. 1,800 July 1,800Apr. 1,800 Aug. 1,800
Her operations manager is considering a new plan, whichbegins in January with 200 units on hand. Stockout cost of lostsales is $100 per unit. Inventory holding cost is $20 per unit permonth. Ignore any idle-time costs. The plan is called plan A.Plan A: Vary the workforce level to execute a strategy thatproduces the quantity demanded in the prior month. TheDecember demand and rate of production are both 1,600 unitsper month. The cost of hiring additional workers is $5,000 per100 units. The cost of laying off workers is $7,500 per 100 units.Evaluate this plan.
Chapter 11 Solutions
Operations Management (McGraw-Hill Series in Operations and Decision Sciences)
Ch. 11 - What three levels of planning involve operations...Ch. 11 - What are the three phases of intermediate...Ch. 11 - Prob. 3DRQCh. 11 - Why is there a need for aggregate planning?Ch. 11 - What are the most common decision variables for...Ch. 11 - Prob. 6DRQCh. 11 - Briefly discuss the advantages and disadvantages...Ch. 11 - What are the primary advantages and limitations of...Ch. 11 - Briefly describe the planning techniques listed as...Ch. 11 - What are the inputs to master scheduling? What are...
Ch. 11 - Prob. 11DRQCh. 11 - What general trade-offs are involved in master...Ch. 11 - Who needs to interface with the master schedule...Ch. 11 - How has technology had an impact on master...Ch. 11 - Service operations often face more difficulty in...Ch. 11 - Name several behaviors related to aggregate...Ch. 11 - Compute the total cost for each aggregate plan...Ch. 11 - A manager would like to know the total cost of a...Ch. 11 - Determine the total cost for this plan given the...Ch. 11 - a. Given the following forecast and steady regular...Ch. 11 - Manager T. C. Downs of Plum Engines, a producer of...Ch. 11 - Manager Chris Channing of Fabric Mills, Inc., has...Ch. 11 - SummerFun. Inc., produces a variety of recreation...Ch. 11 - Nowjuice, Inc., produces Shakewell fruit juice. A...Ch. 11 - Wormwood, Ltd., produces a variety of furniture...Ch. 11 - Refer to Solved Problem 1. Prepare two additional...Ch. 11 - Refer to Solved Problem 1. Suppose another option...Ch. 11 - Prob. 12PCh. 11 - Prob. 13PCh. 11 - Prob. 14PCh. 11 - Prob. 15PCh. 11 - Refer to Example 3. Suppose that regular-time...Ch. 11 - Prob. 17PCh. 11 - Prob. 18PCh. 11 - Prepare a master production schedule for...Ch. 11 - Update the master schedule shown in Figure 11.11...Ch. 11 - Prepare a master schedule like that shown in...Ch. 11 - Determine the available-to-promise (ATP)...Ch. 11 - Prepare a schedule like that shown in Figure 11.12...Ch. 11 - The objective is to choose the plan that has the...Ch. 11 - Prob. 2CQ
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