Gravitational Potential and Potential Energy

Consider a satellite which is rotating in a circular orbit of radius $2R_E$ about the earth. The mass of satellite is $1600 \mathrm{kg}.$ What is the energy required to transfer it to a circular orbit of radius $8R_E?$
$[$use $\left.g=10 \mathrm{ms}{ \mathrm{s}}^{-2}, R_E=6\times {10}^6 \mathrm{m}\right]$