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How to calculate the additional margin of stock index futures?
3937.6 * 300 *10% =118 17 days after the contract is settled in 28 yuan.

Profit and loss =(3937.6-3960)*300= -6720

3960 * 300 *10% =118800 yuan initial investment deposit.

Additional =-(excess margin)-(profit and loss) =-(118800-118128)-(-6720) =-672+6720 =

Need to add 6048 yuan.