A rectangular storage container with an open top is to have a volume of 10 cubic meters. The length of its base is twice the width. Material for the...

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A rectangular storage container with an open top is to have a volume of 10 cubicmeters. The length of its base is twice the width. Material for the base costs $10 persquare meter. Material for the sides costs $6 per square meter. Find the cost of materials for the cheapest such container. Be sure to justify that the cost you find is thecheapest cost for this container. (15 pts)