Opening commission = opening price x specification x commission ratio x lots.

Transaction fee = closing price x specification x handling fee ratio x lots.

Price difference fee = price difference x specifications x lots.

Overnight membership fee = market transaction price x specifications x handling fee ratio x lots.

Extended data:

Oil and gas resources support the rapid development of China's economy. The increase of oil demand and the expansion of oil trade are due to the large-scale use of oil in industrial production.

Before the first world war, oil was mainly used for lighting, and the United States and Russia, which were big oil producers, were also big consumers. In the First World War, the strategic value of oil has initially appeared. Because of its high combustion efficiency and portability, it has great strategic significance for improving the combat effectiveness of the army.

In the 1920s, as oil became the power of internal combustion engines, the demand and trade of oil expanded rapidly. According to the statistics of Wang Yadong, by 1929, the oil trade volume had reached165438+700 million US dollars. During this period, the international oil cargo flows mainly from the United States and Venezuela to Western Europe.

At the same time, the oil in the Soviet Union was rapidly restored and developed. By the end of 1930s, the United States and the Soviet Union became major oil exporters, and international oil trade began to occupy a prominent position in the global energy trade, which promoted the rapid growth of international energy trade and shook the dominant position of coal in the international energy market. During the Second World War, oil played an important role. During World War II, the United States became a major energy supplier to its allies.