Can you pls help, my teacher marked (2,358.75) as the RIGHT ANSWER, but i dont see how he go that.

Thank you

QUESTION: Sally decides to buy a Treasury note futures contract for delivery of $100,000 face amount in December, at a price of 1100.0. At the same time, Scott decides to sell a Treasury note futures contract if he can get a price of 1100.0 or higher. The exchange, in turn, agrees to sell one Treasury note contract to Sally at 1100.0 and to buy one contract from Scott at 1100.0. The price of the Treasury note increases to 11015.0. Calculate Sally's balance on margin account. Assume that initial margin is $1,890.