How to calculate the futures callback of 30%

How to calculate the futures callback of 30%? Futures callback 30%. For example, multiply the current price by 30% and subtract the price adjustment. The current price is 2000, so 2000 * 0.3 = 600.2000-600 = 1400, and this1400 is the current price after the callback 130%.

I am a securities and futures college student. I don't have a securities qualification certificate. I want to practice in a securities company after graduation in June next year. Do you have any recom

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