A catering company must have the following number of clean napkins available at the beginning of each of the next four days: day 1: 15, day 2: 12, day 3: 18, and day 4: 6. After being used, a napkin can be cleaned by one of two methods: fast service or slow service. Fast service costs $0.10 per napkin, and a napkin cleaned via fast service is available for use the day after it is last used. Slow service costs $0.06 per napkin, and a napkin cleaned via slow service is available two days after they were last used. New napkins can be purchased for a cost of S0.20 per napkin. Part A: Formulate the problem as a minimum cost transportation problem. Part B: Solve the problem (provide exact values for all variables and the optimal objective function).
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- For an additional fee, a customer purchasing a Whirlpool appliance, such as washing machine, can purchase a three year service contract. The contract provides free repair service and parts for the specified appliance using an authorized Whirlpool service provider. When a person with Whirlpool service contract needs to repair an appliance such as washing machine, he or she calls the whirlpool repairs and parts department to schedule an appointment. The department makes the appointment and gives the caller the date and approximate time of the appointment. This process is very lengthy. It may take two weeks to schedule a repair visit.In above case what changes could be made to make this process more efficient with the development of Information system. Discuss in detail various phases of System Development life cycle that are involved in this case.A copier is able to operate for an average of 200 hours between repairs, and the mean repair time is two hours. Determine the availability of the copier.The common measures of a queuing system's performance include: O probability that the service facility will be idle, average queue length, and probability that the waiting time will exceed a specified duration. average time each customer spends in the system, probability that the service system will be idle, and average time each customer spends in the queue. average queue length, maximum time a customer may spend in the queue, and the utilization factor for the system. average time each customer spends in the system, maximum queue length, and probability of a specific number of customers in the system. maximum queue length, maximum time a customer may spend in the queue, and average queue length.
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