[HD] Optimization - Open Box & Cost Problem (Pre-Calculus version)

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Question:
A tank with a rectangular base and rectangular sides is open at the top. It is to be constructed so that its width is 4 meters and its volume is 36 cubic meters. If building the tank costs $10 per square meter for the base and $5 per square meter for the sides, what is the cost of the least expensive tank? What are its dimension?
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