The following consecutive readings were taken with a level along a line at common interval of 50 m. the first reading was at change 0+00 where the RL 60.00. The instrument was shifted after the third and seventh reading. 3.150, 2.245, 1.125, 0.860, 3.125, 2.760, 1.835, 1.470, 1.965, 1.225, 2.390, and 3.035m. a/ Enter the readings in a page of level book and calculate the RL of all points. Apply arithmetic checks. Use height of instrument method. b/ Draw the longitudinal section (profile) of the leveling process if you know that the elevation of required road line is 59.80m. (50 mark)