At the end of one day (t=1), a clearinghouse member is long 50 futures contracts, and the settlement price is $200 per contract. On the following day (t=2), the member becomes responsible for clearing additional new 10 short futures contracts (day trades), entered into at a price of $210 per contract. The settlement price at the end of this day is $205. The initial margin is $1,750 per contract. How much does the member still have to add to his margin account with the exchange clearinghouse (on t=2) to meet the initial margin requirement for the 10 new futures contracts, after considering the gain/loss of the 50 old futures contracts and the 10 new futures contracts?

Please give me the process, thank you!