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

### Instruction:
 Greg has his own dog walking business. He charges $20 per dog plus $1 per minute per dog for walking the dog. If he walks one dog for 10 minutes, two dogs for 7 minutes and three dogs for 9 minutes, how much money, in dollars, does he earn?


### Response:
 Greg gagne 20 + 10 = 30 dollars pour promener un chien pendant 10 minutes.
Greg gagne 20 + 2 x 7 = 34 dollars pour promener deux chiens pendant 7 minutes.
Greg gagne 20 + 3 x 9 = 57 dollars pour promener trois chiens pendant 9 minutes.
Donc, Greg gagne 30 + 34 + 57 = 121 dollars en promenant des chiens.