Mr. Nitin, a trading and a clearing member, took proprietary position in August 2007 expiry contract. He bought 10000 units of SAIL@ Rs.140 and sold 8000 units @ Rs.143.50. The end of the day settlement price for August 2007 expiry contact is Rs.141. If the initial margin per unit of SAIL for August 2007 is Rs.42 per unit, then the total initial margin payable by Nitin would be_______