Article 27. Further talks will be held to determine the proportion of the revenues payable to the Annamese government from the customs duties and the taxes on telegraphy, etc, on the level of taxes and customs duties in Tonkin, and on the concessions to be granted in Tonkin to monopolies or industrial enterprises. The sums raised upon these receipts may not be less than 2 million francs. The Mexican piastre and the silver coins current in French Cochinchina shall be legal tender throughout the realm of Annam, alongside the Annamese national currency.