问题详情

Suppose you have to deposit an initial margin of $2 000 on a futures contract and the maintenance margin level is $1 500. When the value of your account drops to $1 400, you are requested to deposit an additional______to avoid position liquidation.
A．$100
B．$600
C．500
D．900请帮忙给出正确答案和分析，谢谢！