In a levelling survey, the summation of all back sights and the summation of all foresights are 7.475 m and 7.395 m, respectively. The reduced level of the initial benchmark is 100.000 m. The reduced level of the last point where the staff is held will be
1
100.000 m
2
100.080 m
3
107.395 m
4
107.475 m