Estimated Cost of Opening Position

Estimated Opening Quantity
Estimated Opening Quantity = Balance / Estimated Cost of Single Contract

Estimated Cost
Estimated Cost = Estimated Cost of Single Contract * Order Quantity

Among them:
Estimated Cost of Single Contract = Estimated Initial Margin + Opening Transaction Fee

Calculation of Estimated Initial Margin and Transaction Fee:
Estimated Buying Initial Margin = Contract Quantity * Contract Value / Min (Limit Price for Buying, Max. Selling Price) * Initial Margin Rate
Buying Transaction Fee = Contract Quantity * Contract Value / Min (Limit Price for Buying, Max. Selling Price) * Taker Fee Rate

Estimated Selling Initial Margin = Contract Quantity * Contract Value / Limit Price for Selling * Initial Margin Rate
Selling Transaction Fee = Contract Quantity * Contract Value / Limit Price for Selling * Taker Fee Rate

Notes:
1. Compared with the current position, the order of increasing current position quantity needs to calculate the cost, and vice versa. For example, if the current long position has 10 contracts, then the order in short position with contracts <= 10 has no cost, and the cost will be added for the quantity greater than 10, i.e. 10 should be added in the final estimated available sell order quantity for opening.
2. The actual opening quantity is related to position and the order status, and subjects to the final order result.

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