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I have posted a link there to this topic so the OP can view my work.Please help!!? lagrange multiplier method?

Find the dimensions of the box which will minimize the TOTAL COST of manufacturing the following open top box of volume 6ft^3?

Solve by the lagrange multiplier method!

Bottom panel costs $3/ft^2

side panel cost $.50/ft^2

Front and back panels cost $1/ft^2