75. The cross-section notes shown below are for a ground excavation for a ground excavation for a 10-m wide roadway. Compute the cross sectional area of sta. 16 +100. 13.65 R a. 58.1125 sq. m b. 55.1385 sq. m 8.2 L 0 +2.15 +3.5 +5.80 c. 52.1958 sq. m d. 54.9125 sq. m