A non conducting solid sphere of radius 100 cm has a

Question

Problem: A non conducting solid sphere of radius 10.0 cm has a uniform value charge density. The magnitude of the electric field at 20.0 cm from the sphere's center is 1.88 x 10³ N/C.

Part A: What is the sphere's volume charge density in uC/m³?

Show how you get the answer, so that I can better understand how to do it.