A TV company produces Smart TVs. The company wants to plan production and workforce levels for the next 6 months. The table below shows the number of workdays and Smart TV demand (in thousands) for each month. Note that if the demand is exceeded, the leftovers can be carried to the next month. If the demand is not satisfied the items are backordered

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter3: Introduction To Optimization Modeling
Section3.8: A Multiperiod Production Model
Problem 22P
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A TV company produces Smart TVs. The company wants to plan production and workforce levels for
the next 6 months. The table below shows the number of workdays and Smart TV demand (in thousands)
for each month. Note that if the demand is exceeded, the leftovers can be carried to the next month. If the
demand is not satisfied, the items are backordered.
The annual inventory holding cost per Smart TV is $120. If the company cannot satisfy a demand on
time, a backorder cost of $30 is incurred. Additionally, past data shows that 25 workers can produce 60
thousand Smart TVs in 20 days. The company currently has 35 workers and 3000 Smart TVs in stock. The
company incurs a hiring cost of $800 and firing cost of $1200 per worker. The company cannot hire or fire
more than 10% of its workforce in any month (i.e., if there are 30 workers at the end of a month, they can
hire or fire a maximum of 3 people starting next month). The payroll is $60 per worker per day.
Suppose that the company cannot change the number of workers they have for the first 3 months. The
company also aims to have at least 25 workers and 10 Smart TVs in stock at the end of the 6 month planning
horizon. Write a Linear Programming (LP) model that identifies the workforce and production plan, aiming
to minimize the total cost.
Month
1
2
3
4
5
6
Workdays
20
22
21
20
22
21
Demand (in thousands)
80
100
90
85
105
95
Transcribed Image Text:A TV company produces Smart TVs. The company wants to plan production and workforce levels for the next 6 months. The table below shows the number of workdays and Smart TV demand (in thousands) for each month. Note that if the demand is exceeded, the leftovers can be carried to the next month. If the demand is not satisfied, the items are backordered. The annual inventory holding cost per Smart TV is $120. If the company cannot satisfy a demand on time, a backorder cost of $30 is incurred. Additionally, past data shows that 25 workers can produce 60 thousand Smart TVs in 20 days. The company currently has 35 workers and 3000 Smart TVs in stock. The company incurs a hiring cost of $800 and firing cost of $1200 per worker. The company cannot hire or fire more than 10% of its workforce in any month (i.e., if there are 30 workers at the end of a month, they can hire or fire a maximum of 3 people starting next month). The payroll is $60 per worker per day. Suppose that the company cannot change the number of workers they have for the first 3 months. The company also aims to have at least 25 workers and 10 Smart TVs in stock at the end of the 6 month planning horizon. Write a Linear Programming (LP) model that identifies the workforce and production plan, aiming to minimize the total cost. Month 1 2 3 4 5 6 Workdays 20 22 21 20 22 21 Demand (in thousands) 80 100 90 85 105 95
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