At what height above the earth's surface, the value of g is same as in mine 80 km deep?

At what height above the earth's surface, the value of g is same as that at a depth of 100 km ?

At what height above the earth's surface, the value of g is same as that at a depth of 100 km ?

At which height above earth's surface is the value of 'g' same as in a 100 km depp mine ?

At which height above earth's surface is the value of 'g' same as in a 100 km depp mine ?

At which height above earth's surface is the value of 'g' same as in a 100 km dip mine ?

At what height above the earth surface, the value of g is half of its value on earth's surface ? Given its radius is 6400 km

At what height h above the earth's surface, the value of g becomes g/2 (where R is the radius of the earth)

A what height above the earth's surface the value of g becomes 25% of its value on the earth if radius of the earth is 6400km.