Suppose at the end of one day a clearinghouse member is long 100 gas futures contracts, and the settlement price is $20,000 per contract. The original margin is$3,000 per contract. On the following day the member becomes responsible for clearing an additional 20 long contracts, entered into at a price of $21,000 per contract. The settlement price at the end of this day is$20,200. How much does the member have to add to its margin account with the exchange clearinghouse?