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Q2. Pawtucket University is planning to buy new copier machines for its library. Three members of its Operations Research Department are analysing what to buy.
Q2. Pawtucket University is planning to buy new copier machines for its library. Three members of its Operations Research Department are analysing what to buy. They are considering two different models: Model A, a high-speed copier, and Model B, a lower-speed but less expensive copier. Model A can handle 20,000 copies a day, and costs $6,000. Model B can handle 10,000 copies a day, but costs only $4,000. They would like to have at least six copiers so that they can spread them throughout the library. They also would like to have at least one high-speed copier. Finally, the copiers need to be able to handle a capacity of at least 75,000 copies per day. The objective is to determine the mix of these two copiers which will handle all these requirements at minimum cost. (a) Formulate an IP model for this problem. (b) Use a branch and bound approach to solve this model. (Solution: No. of high-speed copiers: 2, No. of low-speed copiers: 4, Minimum cost=$28,000.)
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