A city building code requires that the area of the windows must be atleast 1/8 of the area of the walls and the roofs of all new buildings. The annual heationg cost of a new building is $3 per square foot of window area and $1 per spuare foot of wall and roof area. To the nearest square foot, what is the largest surface area a new building can have if its annual heating cost cannot exceed $1000 ?