Differential Leveling $-($correct for curvature and refraction$)$

correct $BS$ rod reading and correct FS rod reading for curvature and refraction before computing $HI$ and elevation of TP$1$

$BS($plus$)$ rod reading $={8\mathrm{.}71}^{\text{'}}$

Horizontal distance to $BS$ rod from instrument $=1,{773\mathrm{.}41}^{\text{'}}$

FS $($minus$)$ rod reading $={3\mathrm{.}83}^{\text{'}}$

Horizontal distance to FS rod from instrument $=1,{172\mathrm{.}57}^{\text{'}}$

What is the elevation of TP$1?$

Round answer to $2$ nd decimal place

example answer $975\mathrm{.}25$

don't enter units.

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