You sell one December futures contracts when the futures price is 900$ per unit. Each contract is on 100 units and the initial margin per contract that you provide is 2, 000$. The maintenance margin per contract is 1000$. During the next day the futures price rises to 920$ per unit. What is the balance of your margin account at the end of the day?

2. Now the price of the futures moves to 910 what will be the margin account at this case?

3. What is going to be the daily returns on the future contract for the seller of the contract in each of these days?