The back sight reading on a benchmark (100m) was 2.750m. If the inverted staff reading to the bottom of a slab is 1.250m. RL of the bottom of the slab is:
A102.750 m
B103.00 m
C104.00 m
D101.500 m

A102.750 m
B103.00 m
C104.00 m
D101.500 m
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