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How to calculate the liquidation price
https://www.binance.com/en/support/faq/b3c689c1f50a44cabb3a84e663b81d93 -
How to know the open cost
https://www.binance.com/en/support/faq/87fa7ee33b574f7084d42bd2ce2e463b -
How mark price is calculated
https://www.binance.com/en/support/faq/360033525071