A computer-manufacturing plant produces mice, keyboards, and video-game joysticks. The per-unit profit, per-unit labor usage, per-unit machine-time usage, and monthly demand are given in the following table:

Each month, a total of 13,000 labor hours and 3,000 hours of machine time are available. How can the manufacturer maximize its monthly profit contribution from the plant?

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Profit/unit Labor usage/unit Machine time/unit Monthly demand Mice $8 0.2 hour 0.04 hour 15,000 Keyboards $11 0.3 hour 0.055 hour 29,000 Joysticks $9 0.24 hour 0.04 hour 11,000