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

### Instruction:
 Max has a collection of stamps in three colors: 20 red stamps, 80 blue stamps and 7 yellow ones. He is trying to sell the whole collection. He already sold 20 red stamps for the price of $1.1 for each stamp and 80 blue stamps for the price of $0.8 for each stamp. What price did he need to set for each yellow stamp to be able to earn the total of $100 from the whole sale?


### Response:
 Le montant total d'argent que Max a gagné grâce à la vente des timbres rouges et bleus est de 20*1.1 + 80*0.8 = <<20*1.1+80*0.8=88>>88 dollars.
Max a vendu 20 timbres rouges et 80 timbres bleus, il lui reste donc 7 timbres jaunes.
Le prix de chaque timbre jaune devrait être (100-88)/7 = <<(100-88)/7=2.2857>>2.2857 dollars.