That is to say. You have fuel. That is, the price of 10 ton fuel oil is 38,880 yuan.

But futures have a margin system.

If the deposit is 7784 yuan. Prove that your margin ratio is 20%

That is to say, the margin of first-class fuel oil = one ton (3888) times 1 hand (10 ton) times the margin ratio (20%)= 7784 yuan.