Open box optimization (Like Stewart 4.7.16)

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A rectangular storage container with an open top is to have a volume of 10 m^3. The length of this base is twice the width. Material for the base costs $15 per square meter. Material for the sides costs $9 per square meter. Find the cost of materials for the cheapest such container. (Round your answer to the nearest cent.)
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Excellent video instruction. Thank you.

kiracook
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