4. The following data are the cross section notes at Station \( 1+020 \) and \( 1+040 \). The natural ground slope is almost even.Base width Cut \( =9 \mathrm{~m} \) Fill \( =8 \mathrm{~m} \)Side slope Cut = 1:1 Fill = 1.5:1 a) Compute the area of section \( 1+020 \) b) Compute the area of section 1+040 c) Compute the difference in volume of cut and fill using end area method with prismoidal correction.