Physics Gravitation Level: Misc Level

At some point in the future, after the Earth Olympics, the Milky Way Olympics are held on the planet Zarkon. (Zarkon is inhabited by folks who like to think up physics questions.) This planet has a mass that is 0.100 that of the Earth,and a radius that is 0.500 that of the Earth.Zarkon also has a little moon Abba (that is rumored to be populated by retired Swedish rock stars).Abba has a mass which is 0.010 that of Zarkon, and a radius which is 0.20 that of Zarakon. What is the acceleration of gravity(gabba ) at the surface of Abba? Use gse zarkon =3.92 m/s2 to answer the next two question (if necessaryi).