Eight point charges, each of magnitude q $=7\mathrm{.}01$e$-06$ ?C$,$ ?are located on the corners of a cube of edge s$=28\mathrm{.}2$ ?cm$,$ ?as shown in the figure. What is the magnitude of the resultant force exerted by the other charges on the charge located at point A$?$

X q S q S S 9 q q Point A q q q y