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A positive point charge of magnitude 2.4 micro Coulombs is at the center of an uncharged spherical conducting shell of inner radius 65 cm and outer radius 85 cm.

I have been trying to calculate the total charge for the inner sphere. I solved for the Electric Field by using E=kq/r^2, then using Coulombs law to obtain Q in micro Coulombs, but I end up with a wrong answer. Could someone please explain what I am doing wrong.