A closed rectangular box to contain 16 ft³ is to be made of three kinds of materials. The cost of the material for the top and the bottom is Php18 per square foot, the cost of the material for the front and the back is Php16 per square foot, and the cost of the material for the other two sides is Php12 per square foot. Find the dimensions of the box such that the cost of the mațerials is a minimum.

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