Note that in French we use the definite article (le, la, les) with weights and measures to mean per or a/an kilo, litre, etc
Look at these examples:
Le pâté se vend à 1,25 € les 100 grammes.The pâté is sold at € 1.25 per 100 grams.
Les pommes coûtent 1,50 € le kilo.The apples cost € 1.50 per kilo
J’ai payé 2000 € la tonne.I paid € 2,000 per ton
Ça coûte 1,20 € le litre.It costs € 1.20 per litre.
Regarde ces huîtres ! Et elles coûtent seulement 10 € la douzaine !Look at these oysters! And they're only € 10 per dozen!
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.
Il le vend 3 € la livre.He sells it € 3 per pound.
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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