Hello! I am having problems in solving this problem. I don't know where to star but I have some formulas that I started with and I don't know what to do from there.

Your task is to build a steel drum (right circular cylinder) of fixed volume. This time the consideration of waste material is added, but the material cost is still the same for the top and the sides (same gage and same cost) the tops and the bottoms will be cut from sheet metal from squares of length 2r. Use calculus to determine the amount of metal used is minimized when h/r=8/π.

I have just the formulas:

--Area of a cirlce

--Volume of a cylinder

--Area of a square

I will appreciate your help