At the end of one day a clearing house member is long $120$ contracts, and the settlement price is $$45,000$ per contract. The original margin is $$2,000$ per contract. On the following day the member becomes responsible for clearing an additional $20$ long contracts, entered into at a price of $$45,100$ per contract. The settlement price at the end of this day is $$45,200.$ How much does the member have to add to its margin account with the exchange clearing house?