A closed rectangular box whose base is twice as lone as it is width has a volume of 36000 cm^3

rectangular-box

#1

A closed rectangular box whose base is twice as lone as it is width has a volume of 36000 cm^3. The material for the top costs 10 per square cm, for the side and bottom costs 5 per square cm. Find the dimensions that will make the cost of making the box a minimum?

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