18? An inverse method of leveling is executed between two existing concrete structures and across a concrete wall located midway between the two structures. All rod readings, as indicated in the accompanying sketch, were taken with the rod held upside down. Cone Wall - A Bottom Line of Bottom Line of Concrete Beam Concrete Beam (Elev - 240.05 m) [Elev Unknown) Leveling Leveling Rod Rod Leveling Rod 2.05 m 2.87 m 2.75 m 2.30 m (BS] [FS) (BS) [FS] L-2 L-1 From the data portrayed if the elevation of A (bottom of the concrete beam of the first structure) is 240.05 m, the elevation of the bottom of the concrete beam of the second structure (indicated as C) should be a) 234.68 m d) 238.78 m b) 240.42 m e) 242.40 m c) 239.68 m Solution