Help with electric force question please!?

Question

The electric field everywhere on the surface of a thin spherical shell of radius 0.750 m is measured to be equal to 890 N/C and points radially toward the center of the sphere. What is the net charge with the sphere's surface?

Answer 1

E=q/4πεr^2
plugging and solving

890=q/4πε(0.75)^2

q=890*4π*8.85E-12*(0.75)^2=55.7 nC