A staff is placed on a benchmark (BM) of reduced level (RL) $100.000 m$ and a theodolite is placed at a horizontal distance of $50 \mathrm{~m}$ from the $\mathrm{BM}$ to measure the vertical angles. The measured vertical angles from the horizontal at the staff readings of $0.400 \mathrm{~m}$ and $2.400 \mathrm{~m}$ are found to be the same. Taking the height of the instrument as $1.400 \mathrm{~m}$, the RL (in $m$ ) of the theodolite station is

A staff is placed on a benchmark (BM) of reduced level (RL) $100.000 m$ and a theodolite is placed at a horizontal distance of $50 \mathrm{~m}$ from the $\mathrm{BM}$ to measure the vertical angles. The measured vertical angles from the horizontal at the staff readings of $0.400 \mathrm{~m}$ and $2.400 \mathrm{~m}$ are found to be the same. Taking the height of the instrument as $1.400 \mathrm{~m}$, the RL (in $m$ ) of the theodolite station is

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