Question

If the mass of Earth is 80 times that of the moon and its diameter is double that of the moon, and g on Earth is 98 m/s², then the value of g on the moon is:
(a) 0.49 m/s²
(b) 1.96 m/s²
(c) 3.92 m/s²
(d) 7.84 m/s²