Dhar bought two articles A and B at a total cost of Rs.8000. He sold article A at 20% profit and article B at 12% loss. In the whole deal he made no gain and no loss. At what price should Dhar have sold article B to make an overall profit of 25%? `R s .5200` b. `R .6400` c. `R s .5800` d. `R s .6200`