A hollow non conducting sphere  $A$ and a solid non conducting sphere  $B$ of equal radius  '$R$' and masses $m$  and $2m$ are kept a large distance apart on a rough horizontal surface. Charge on the two spheres  $A$ and  $B$ are  $Q$ and  $-2Q$ respectively. Charges are distributed uniformly and remain constant and uniform as the spheres come closer. Friction is sufficient to support pure rolling and the kinetic energy of the two spheres just before collision is  $K_A$ and  $K_B$. Find  $100\times \frac{K_A}{K_B}.$