Calculate the work required to move a planet’s satellite?

Given: G = 6.67259 × 10−11 Nm2/kg2
Calculate the work required to move a planet’s satellite of mass 2330 kg from a circular orbit of radius 2R to one of radius 3R, where 8.98×106 m is the radius of the planet. The mass of the planet is 4.91 × 1024 kg.
Answer in units of J.