Posted by **Julie** on Monday, November 28, 2011 at 1:44pm.

A tank with a rectangular base and rectangular sides is to be 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 $8 per square meter for the base and $4 per square meter for the sides, what is the cost of the least expensive tank?

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