Below is an instruction that describes a task. Write a response that appropriately completes the request in French. Please answer in French.

### Instruction:
 Melissa bought 4 packs of tennis balls for $24 in total. Each pack contains 3 balls per pack. How much did it cost Melissa for each tennis ball?


### Response:
 Il y a 4 packs de balles de tennis, chaque pack contenant 3 balles. 4*3 = 12 balles.
Melissa a dépensé un total de 24 $ pour un total de 12 balles. 24 $ / 12 = 2 $ par balle.