The calculation formula of liquidation profit and loss is:
Profit and loss of liquidation on that day = (closing price-opening price) × liquidation amount;
Deferred to liquidation surplus = (liquidation price-settlement price of the previous day) × liquidation amount.
When selling and closing positions, the positive number in the above formula is profit and the negative number is loss; When buying a peace warehouse, the situation is just the opposite. When calculating the investment income, the above liquidation gains and losses shall be deducted from the trading commission.