On April 28th, I bought the IF 1405 contract 1 lot at 2 147.8. After 18 days, when the contract expires, it is 1000 points, and the deposit ratio is 10%. Then, when the contract expires, the deposit for this contract needs 30,000 yuan. Add 18 days to lose money (2 147.8- 1000)*300 yuan = 344,340 yuan. If you want to hold this contract 18 days, you must have at least 30,000 yuan+344,340 yuan = 374,340 yuan in your account.

I'm also curious about how 30W came out. . . . I hope someone can give an answer.