The wording of this question puzzles me because if they are in orbit they feel no gravitational force since the centripetal acceleration (v^2/R) exactly balances earth gravity.
However if you wish to separate out those two factors then use
Forbit = G m Me / Rorbit^2
Fground = G m Me Rearth^2
so 100*Forbit/Fearth
= 100 *Rearth^2/Rorbit^2
Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface.
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