13. A supplier for the electronics industry manufactures keyboards and screens for graphing calculators at plants in Mexico and Taiwan. The hourly production rates at each plant are given in the table. How many hours should each plant be operated to exactly fill an order for 4,000 keyboards and 4,000 screens? Solve using the method of your choice. Technology is allowed. (6) Plant Keyboards Screens Mexico 40 32 Taiwan 20 32

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