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

### Instruction:
 Janet is considering two options to retile her bathroom. The turquoise tiles cost $13/tile and the purple tiles cost $11/tile. If Janet needs to tile two walls that measure 5 feet by 8 feet and 7 feet by 8 feet, and each square foot of wall takes 4 tiles, how much will Janet save by buying the purple tiles instead of the turquoise ones?


### Response:
 Le premier mur mesure 40 pieds carrés et le deuxième mur mesure 56 pieds carrés.
La superficie totale est de 40 + 56 = 96 pieds carrés.
Chaque pied carré prend 4 carreaux, donc le nombre total de carreaux nécessaires est de 96 x 4 = 384 carreaux.
384 carreaux turquoise coûtent 13 $/carreau x 384 carreaux = 4988 $.
384 carreaux violets coûtent 11 $/carreau x 384 carreaux = 4264 $.
Janet économise 4988-4264 = 724 $.