This refers to the handling fee standard. "Beans 6, meal 6, wheat 4, glue 10, corn 4, fuel oil 4..." are the handling fee standards charged for each lot. These are A fixed value, such as "Bean 6" means that the handling fee for each lot of soybeans is 6 yuan.

The copper fee of 0.28‰ means that the handling fee for copper is not a fixed value, but calculated based on the transaction amount, that is, 0.28‰ of the transaction amount (0.28 thousandths, or 2.8 thousandths).

If you buy one lot of copper, the price is 30,000 yuan/ton, each lot is 5 tons, the total price is 150,000, and the handling fee is 2.80/10,000, which is 15*2.8=42 yuan...