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Aggregate Production Planning Assessment Questions & Answers

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Aggregate Production Plan (20 marks)

Question

In order to satisfy the production requirement, the company can vary its capacity by hiring or laying off workers and running overtime production. The following assumptions are made.

  • Inventory and backorder costs are calculated using ending inventory/backorder of each month.
  • Hiring or layoff costs are incurred when the number of workers changes.
  • The number of workers in each month should be an integer. Once scheduled, all workers will produce at their full potential each month.
  • The ending inventory requirement of June stated in Cell “B11” of the sheet “Aggregate” must be satisfied.
  • Consider the following three different strategies.

(a)  A chase strategy by varying the number of workers. That is, use the minimum number of workers in each month to make the ending inventory of each month non-negative. No overtime production.

(b)  A level strategy to meet the overall production requirement. That is, use a constant number of workers for these 6 months; demand variations are absorbed by inventory and backorders. Hiring and layoff only happens at the beginning of January. No overtime production.

(c)  Stable workforce with overtime so that there is no backorder in all months. That is, set a constant number of workers for these 6 months; do overtime production if necessary; no backorder is allowed at the end of each month. Hiring and layoff only happens at the beginning of January.

Develop three plans using the above three strategies, respectively. Your plans should be cost- effective among the plans that satisfy the requirements. (For example, using one thousand workers can satisfy some of the above requirements, but it is obviously not cost-effective, i.e., minimizing the cost.)

 

Initial number of workers 12
Productivity 2 units per worker hour
Regular hours per month 200 hours
Regular time salary 14 $ per hour
Overtime salary 19 $ per hour
Inventory holding cost 2 $ per unit per month
Backorder cost 11 $ per unit per month
Hiring workers 4500 $ per worker
Laying off workers 5000 $ per worker
Beginning Inventory of January 300 units
Required Ending Inventory of June 700 units (at least these many units)
     

 

Period 1 2 3 4 5 6 Total
Demand 6900 8600 8600 8800 7500 7300 47700
Number of workers              
               
Beginning Inventory              
Regular production quantity              
Overtime production quantity              
Ending Inventory (use negative for backorder)              
Costs:
Hiring cost
Layoff cost
Regular labour cost
Overtime labour cost
Inventory holding cost
Backorder cost
Total cost:

 

 

Reference ID: #getanswers2001195

 

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