Question: 4. A rectangular storage container with an open top is to have a volume of 20 m3. The length of its base is three times

4. A rectangular storage container with an open top is to have a volume of 20 m3. The length of its base is three times the width. Material for the base costs $5 per square meter. Material for the sides cost $9 per square meter. Find the cost of materials for the cheapest such container.

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