In French, the definite article (le, la, les) is used with weights and measures to mean per or a/an kilo, litre, etc
Learn how to use the French definite articles with weights and measures
Look at these examples:
Note that a Euro is divided into 100 "centimes". Different countries use "cent" but since this means 100 in French, to avoid confusion, we continue to use the same word that was used before the adoption of the Euro.
-> Note here that livre (pound) is a feminine word, unlike livre (book) which is masculine (See Some French nouns have different meanings depending on whether they're masculine or feminine)
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