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IPC manufacturers resins and molded plastic products. One production department has ten injection-molding machines.

IPC manufacturers resins and molded plastic products. One production department has ten injection-molding machines. The maintenance manager at the plant is studying this group of machines to determine how often the department should shut down all of the machines and perform preventive maintenance. The nature of the department and its processes causes preventive maintenance to be performed on all of the machines at one time at a cost of $10,000 for the entire group of machines. When a machine breaks down, it costs $2000 to repair it. The data from production records about machine breakdowns between PM has been analyzed and is provided below:

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