Question: A closed rectangular box is to be built so that its volume is 60 ft3. The costs of the material of the lid and the

A closed rectangular box is to be built so that its volume is 60 ft3. The costs of the material of the lid and the base are 10 and 20 cents/ft^2, respectively. The cost of the sides is 2 cents/ft^2. Determine the Cost function C(x,y) where x and y represent the length and width of the box. Find the dimensions of the box that will give the minimum cost and find the minimum cost.

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