The roof of a room was considered as the BM. Inverted staff reading on this BM was 3.500 m. The staff reading of point P on the ground was 1.200 m. Find the RL of point P, if the RL of the bench mark is 100 m.
1
102.3 m
2
104.7 m
3
95.3 m
4
97.7 m
5
100.0 m