Yesterday, you entered into a futures contract to buy e125,000 at $1.2500 per e. The initial margin for this contract is $5,400. The maintenance margin requirement is $4,000. Suppose the futures price closes today at $1.2125. What is your margin account balance after today's closing?

(a) -4,687.50 (b) 4,687.50 (c) 712.50 (d) 10,087.50

The answer is (c) 712.50, need help with the math.