Tidal Force

Phobos is one of the two moons of Mars. It orbits $9376$ km from Mars' center.
Phobos is $11.27$ km in mean radius; and has a mass of $1.06 \times 10^{16}$ kg. By what fraction do gravitational tides from Mars change Phobos' surface gravity? Express your answer as a decimal rounded to the nearest hundredth.