Problem on Levelling No 2 - Height of Instrument and Rise & Fall Method

The following consecutive readings were taken with a dumpy level. The level was shifted after 4th, 6th and 8th readings. Reduced level at the first point was 100.00. Prepare a level field work table. Calculate the reduced levels of the points by height of instrument method and apply the usual arithmetic check. 6.21, 4.92, 6.12, 8.42, 9.81, 6.63, 7.91, 8.26, 9.71, 10.21 Rise & Fall Method