Calculation method: the profit and loss of the day = ∑ [(selling price-settlement price of the day) × selling quantity× contract multiplier]+∑ [(settlement price of the day-buying price )× buying quantity× contract multiplier]+(settlement price of the previous trading day-settlement price of the day) × (selling position of the previous trading day-buying position of the previous trading day )× contract multiplier? .

Extended data

When the book balance of the margin is lower than the maintenance margin, the trader must make up the margin within the specified time to make the margin account balance (settlement price x position x margin ratio), otherwise the exchange or institution has the right to carry out compulsory liquidation on the next trading day. This part of the margin that needs to be replenished is called additional margin.

Still according to the above example, suppose that on the third day after the customer bought 50 tons of soybeans at a price of 2700 yuan/ton, the settlement price of soybeans fell to the additional margin. 2600 yuan/ton. Due to the price drop, the customer's floating loss is 5000 yuan (i.e.

As the balance is less than the maintenance deposit (= 2 700x50x5% x 0.75 = 5 062.5 yuan), the customer needs to make up the deposit to 6750 yuan (2 700x50x5%), and the additional deposit is 5 000 yuan (6 750- 1 750).

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