At the end of day one, a futures trader held a short futures position with 500 contracts on a certain underlying at a price of $10,000 per contract. The initial margin is set at $500 per contract. On the following day, this trader shorted an additional 200 contracts of the same underlying at a price of $9,500 per contract. The settlement price at the end of day two is $9,800 per contract. How much does the trader in short position have to add to his / her margin account balance with the Futures clearing house to maintain his / her initial margin level of $500 per contract? (6 marks) (insert your answer here)