Hey guys, I would appreciate your help on this one...

A company that constructs containers faces the following problem. The material for a rectangular container costs £3 per square foot for the bottom and £2 per square foot for the sides and top.
Find dimensions of the container so that the volume is 12 cubic feet and the cost is minimum.

Please help!

Just barely a finance problem.

Box it Length * Width * Height

Bottom = Length * Width
Top = Length * Width
Sides = 2*(Length * Height) + 2(Width * Height)

Now what?