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Majestic_
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Homework Statement
The length of a cedar chest is twice its width. The cost/dm^2 of the lid is four times the cost/dm^2 of the rest of the cedar chest. If the volume of the cedar chest is 1440 dm^3, find the dimensions so that the cost is a minimum.
Homework Equations
LWH = 1440
W = 2L
The Attempt at a Solution
I don't even know where to start. Can anyone help me get started? I've never seen a question like this in my examples, so I'm kind of lost.