At a certain height above the earth's surface the gravitational is 4% of its value at the surface of the earth. Find the height (R is the surface of the earth)

At a certain height above the earth's surface the gravitational is 4%

1.	At a certain height above the earth's surface the gravitational is 4% of its value at the surface of the earth. Find the height (R is the surface of the earth)
Answer» 2R 4R R R/2 Answer :B