BusinessSept. 30 is last date for exchanging Rs.500 old design banknoteSaeed AbbasiSeptember 30, 2011September 30, 2011 by Saeed AbbasiSeptember 30, 2011September 30, 2011 Karachi: September 30, 2011 is the last date for exchanging Rs. 500 old design (bigger size) banknote....