On 1/30 at the end of the day, Joan sold (took a short position in) 1 futures contract (one contract is agreement to buy or sell Euros 45,500 ) at a rate of USD 1.35 per Euro, contract expires on 6/18. Initial margin =$1,330 and maintenance margin is $1,005. On 1/31 and 2/1, the futures rate expiring on 6/18 is USD 1.365, and USD 1.370 respectively. As per "Marked to Market" daily mechanism of currency futures contracts, what shall be Joan's margin account balance at the end of 1/31(Assuming that Joan will not withdraw money from her margin account)? On 1/31, Joan received a margin call from the broker to deposit $682.5 to bring up her margin balance on 1/31 back to $1,330. On 1/31, Joan received a margin call from the broker to deposit $357.5 to bring up her margin balance on 1/31 back to $1,005. On 1/31, Joan's margin balance was $2,012.5 due to the gain of $682.5 realized from the change in the futures rate. On 1/31, Joan's margin balance was $647.5 due to the loss of $682.5 realized from the change in the futures rate