The cost, C, in dollars, of insulating a wall is directly proportional to the area, A, of the wall (measured in ft2) and the thickness, t, of the insulation (measured in inches). The resulting equation is c. A storage room is 25 ft by 30 ft with 8-ft-high ceilings. Assuming no windows and one uninsulated door that is 3 feet by 7 feet, what is the total area of the insulated walls for this room