An electronics corporation manufactures four highly technical products that it supplies to aero-space firms. Each of the products must pass through the following departments before being shipped: wiring, drilling, assembly, and inspection. The time requirement (in hours) for each unit produced, the available time in each department each month, minimum production levels for each product, and unit profits for each product are summarized in the following table:

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CAPACIT PRODUC EC22 EC49 NC45 NC79 (HOURS) Wiring 0.5 1.5 1.5 1.0 15,000 Drilling 0.3 1.0 2.0 3.0 17,000 Assembly 0.2 4.0 1.0 2.0 10,000 Inspectio 0.5 1.0 0.5 0.5 12,000 Unit $9 $12 $15 $11 Minimum 150 100 300 400