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Hangzhou March 1 Futures Trading
Personally, I think your understanding is correct. Profit and loss of futures positions: 300 yuan × (September 17 futures settlement price-March 1 day futures quotation )× number of short contracts.

March 1 futures quote is 3400 points, so it should be 3500-3400, not 3324 written in the book. I believe that all books are better than no books.