Two Pegs $A$ and $B$ were fixed on opposite banks of a $50 \mathrm{~m}$ wide river. The level was set up at $A$ and the staff readings on Pegs $A$ and $B$ were observed as $1.350 \mathrm{~m}$ and $1.550 \mathrm{~m}$, respectively. Thereafter the instrument was shifted and set up at B. The staff readings on Pegs $\mathrm{B}$ and $\mathrm{A}$ were observed as $0.750 \mathrm{~m}$ and $0.550 \mathrm{~m}$, respectively. If the R.L. of Peg $\mathrm{A}$ is $100.200 \mathrm{~m}$, the R.L. (in $\mathrm{m}$ ) of $\operatorname{Peg} B$ is

Two Pegs $A$ and $B$ were fixed on opposite banks of a $50 \mathrm{~m}$ wide river. The level was set up at $A$ and the staff readings on Pegs $A$ and $B$ were observed as $1.350 \mathrm{~m}$ and $1.550 \mathrm{~m}$, respectively. Thereafter the instrument was shifted and set up at B. The staff readings on Pegs $\mathrm{B}$ and $\mathrm{A}$ were observed as $0.750 \mathrm{~m}$ and $0.550 \mathrm{~m}$, respectively. If the R.L. of Peg $\mathrm{A}$ is $100.200 \mathrm{~m}$, the R.L. (in $\mathrm{m}$ ) of $\operatorname{Peg} B$ is

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