A roadway is to be designed on a level terrain. The roadway is 500 ft. Six Cross Sections have been selected at 0 ft, 100 ft, 200 ft, 300 ft, 400 ft, and 500 ft. . The cross sections have areas of 130 ft2, 140 ft2, 70 ft2, 110 ft2, 80 ft2, and 25 ft2. What is the volume needed along this road.