How much should I pay for the first-hand methanol futures trading?

According to the latest standards of Zhengshang Institute, the methanol futures fee is 2 yuan, and the 2 yuan is opened and closed, that is, the position is opened+the position is closed in 4 yuan;

However, the variety of methanol futures is a bit special. Some contracts in Pingjincang are three times as large as those in opening positions, as shown in the following figure:

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