Suppose 8 point particles each with charge Q are placed randomly on a circle of radius R centered at (x0, y0), creating an electric potential of V0. If 10 point particles of charge -Q are now interspersed among the original particles, find the new electric potential Vnew at (x0, y0) in terms of V0 and supply the missing numerical factor below.


Vnew = ( ________ )Vo