Coking coal is calculated according to the quotation 1300, 1300 times 7%=9 1. That is to say, it can fluctuate 9 1 point on the basis of the closing price of the previous trading day, and 7% is not 7 points, okay? Another correction is that the fluctuation of coking coal is 9%, not 7%. The contract details of each variety can be sent to you. The futures commission is the lowest in the industry.