A company produces card board boxes with the top, bottom and sides measuring 3 feet. It cost the company 4 cents a square foot to make each box. The square footage is determined by finding the area of all six sides of the box. Find the cost to make 200 boxes.

Answer 1

since all six sides are squares, and cost = area * unitcost, we have
cost = 6 * 3^2 * 0.04 * 200 = $432.00

unless you meant that the top, bottom and sides had an area of 3 ft^2, and not a side length.
In that case, just divide by 3