Assume the current spot price of oil is $90/barrel and the future price is $90.64/barrel. You enter into 4 long future contracts today (2/20/17), each contract is for 100 barrels of oil. Your initial margin is $1,500 per contract and your margin call occurs at $1,000 per contract.

date	price
2/20/2017	90.64
2/21/2017	93.55
2/22/2017	96.87
2/23/2017	92.99
2/24/2017	89.48
2/27/2017	85.22
2/28/2017	83.33
3/1/2017	85.52

What does your margin account have in it at the end of each day? If there is a margin call, note that there is a margin call and record that you deposit the necessary money into the account as a separate transaction instantaneously, i.e. if on 2/27 you needed to put in $1,500 at the end of the day you should show a deposit of $1,500 on 2/27 after the close of the day.