The Percentage on Freight rule calculates the amount as the cargo freight the various item is created for divided by 100 and multiplied by the entered rate.
Amount=CargoFreight÷100×Rate
For example, if the cargo freight is 100,000 USD, and various rate is 10 EUR, the various amount will be 100,000 / 1.2 / 100 * 10 = 8,333.33
100,000÷1.2÷100×10=8,333.3(3)
where 1.2 is the exchange rate between USD and EUR.
Important notes about the Percentage on Freight rule
If the freight changes, the various amount will remain the same and will not automatically adjust to the new freight.