A point charge of -2.00 C is located in the center of a spherical cavity of radius

A point charge of -2.00 µC is located in the center of a spherical cavity of radius 6.50 cm inside an insulating charged solid. The charge density in the solid is p = 7.35 X 10-4 C/m3. Calculate the electric field inside the solid at a distance of 9.50 cm from the center of the cavity.