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A company produces iPhone and iPad.
The profit for one iPhone is 6 (hundres USD)
The profit for one ipad is 5 (hundres USD)
To produce one iPhone requires 9 hours of labor and 4 hours of shipping
To produce one ipad requires 8 hours of labor and 1 hours of shipping
The company can supply a maximum of 90 hours of labor and 30 hours of shipping
How many iPhones and iPads the company should produce to maximize the profit.