Let x=length, y=width, z=heighth
The volume is given by
Cost for all but top=c(xy+2yz+2xz)
Cost for top=35c(xy)
Does this get you started?.
theres a rectangular box, where the material for the lid is 35 times more expensive per/m2 then the material for the rest of the box.The volume is 3m3. I need to find the dimentions for the minimum cost.
I did a diagram. That's my speciality, but am stuck after that.(the blank page scares me).
any aid would be terrific.