First, buy and open positions at 2900, with a settlement price of 2960, and settle on the same day, with a profit of 60; 3000 is the closing price, which has nothing to do with the profits of the day and the next day. Continue to hold positions, and when the next day is settled, it will be calculated according to the settlement price of the next day.

Secondly, 2900 sold the opening position, the settlement price was 2960, and it was settled on the same day, with a loss of 60; Also regardless of the closing price of 3000,

The daily opening price is generated by call auction, not determined by the settlement price and closing price. The benchmark for daily opening or closing is the comparison between the opening price and yesterday's settlement price.