The area of the base and top are both x^2, the area of each of the four

sides is xy. There for the totl surface area is:

A=2x^2+4xy square inches (assume x and y are in inches).

We are also told that the volume of the box is 5000 cubic inches, but we also

know that the volume of the box is length times breadth times height=x^2y.

so: x^2y=5000, or y=5000/x^2. So now substitute this back into the

equation for the surface area:

A=2x^2+4x(5000/x^2)=2x^2+20000/x square inches.

RonL