There is no contract size mentioned. The image entirely compasses the whole question.

Assume you have a short position on one CME EUR futures contract entered into at a settlement price of $1.3140/EUR. To maintain the position, your performance bond account currently has a balance of $1,700.00. The maintenance level is set at $1,500.00. Use this numerical format in your responses: XXXX.XX (no comma separator). Over the next three days, the settlement prices are $1.3126, $1.3155, and $1.3049. On day 1 the balance in your performance account would be $ and you get a margin call. On day 2 the balance in your performance account would be $ and you get a margin call. On day 3 the balance in your performance account would be $ and you get a margin call