According to the practice of foreign trade industry, the quotation of general export commodities is based on the spot exchange rate of US dollar and RMB at that time.

If there is a tax rebate for export commodities, the tax rebate can be deducted from the cost when calculating the cost, and then the export cost can be calculated.

If the US dollar exchange rate shows an upward trend, we can predict the future increase of the exchange rate according to the degree of the trend, and increase the calculation base of the exchange rate according to the increase.