A contractor is to build a warehouse whose rectangular floor will have an area of 2000 square feet. The warehouse will be separated into two rectangular rooms by an interior wall. The cost of the exterior walls is $125 per linear foot and the cost of the interior wall is $100 per linear foot. Express the contractor's total cost of building the walls, C, as a function of x, where x is the length of the warehouse's rectangular floor that is perpendicular to the interior wall C(x)=(Simplify your answer.) GITTA