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

### Instruction:
 Carl is taking a class where the whole grade is based on four tests that are graded out of 100. He got an 80, a 75 and a 90 on his first three tests. If he wants an 85 average for the class, what is the minimum grade he needs to get on his last test?


### Response:
 Carl a besoin d'un total de 340 points car 85 x 4 = <<85*4=340>>340
Il a déjà 245 points car 80 + 75 + 90 = <<80+75+90=245>>245
Il doit obtenir un 95 à son dernier test car 340 - 245 = 95