can you help me with drawing a trade of surface for the above question and also write the penalty function Z*. The lightest material is the one with

can you help me with drawing a trade of surface for the above question and also write the penalty function Z*.

The lightest material is the one with the lowest value of ρ/σy, and the material with the lowest price is the one with the lowest value of Cmρ/σy. 

mark trade off