Pullman Tire Company would like to plan production for the next three months. The firm can satisfy demand by using inventory, regular production (at $40 per tire), overtime (at $50 per tire), or subcontracting (at $70 per tire). Any tires held over for one month incur a $2 per tire inventory carrying cost. Pullman Tire has sufficient regular production capacity to produce up to 700 tires each month, and it can produce up to 50 more tires each month using overtime. The subcon- tracting availability from an alternative supplier is 150 in January and February and 130 in March. Customers will demand 650 tires in January, 1,000 in Febru- ary, and 890 in March (all demand must be satisfied on time; i.e., no backorders are allowed). The firm begins with 100 tires and wants to have no tires left in inventory at the end of March. Formulate a linear program for this problem, and determine the cheapest tire production plan after solving the problem in Excel.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter4: Linear Programming Models
Section: Chapter Questions
Problem 107P
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Pullman Tire Company would like to plan production for the next three months.
The firm can satisfy demand by using inventory, regular production (at $40 per tire), overtime (at $50 per tire), or subcontracting (at $70 per tire). Any tires held over for one month incur a $2 per tire inventory carrying cost. Pullman Tire has sufficient regular production capacity to produce up to 700 tires each month, and it can produce up to 50 more tires each month using overtime. The subcon- tracting availability from an alternative supplier is 150 in January and February and 130 in March. Customers will demand 650 tires in January, 1,000 in Febru- ary, and 890 in March (all demand must be satisfied on time; i.e., no backorders are allowed). The firm begins with 100 tires and wants to have no tires left in inventory at the end of March. Formulate a linear program for this problem, and determine the cheapest tire production plan after solving the problem in Excel.

This is the answer but I am unsure how to get it: Produce 700 units with regular production in all three months. Produce 50 units during overtime during all three months. Use no subcontracting in January, 60 units of subcontracting in February, and 130 units of subcontracting in March. Total cost = $105,220

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