At what height above earth's surface, value of g is same as in a mine 100km deep?

Let height be h
we know that for variation of g with height,
g=g01-2hR ----(1)
and for variation in g with depth
g=g01-dR        -------(2)

where d is the depth.

according to the question
g01-2hR=g01-dR2hR=dRh=d2=1002=50km

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