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

### Instruction:
 Iain has 200 pennies. He realizes that 30 of his pennies are older than he is. If he wishes to get rid of these pennies and then throw out 20% of his remaining pennies, how many will he have left?


### Response:
 Commencez par retirer les anciennes pièces de monnaie 200 pièces de monnaie - 30 pièces de monnaie = <<200-30=170>>170 pièces de monnaie.
En jetant 20% des pièces de monnaie, 170 pièces de monnaie * 0,2 = <<170*.2=34>>34 pièces de monnaie.
Après avoir jeté les anciennes pièces de monnaie et les 20%, Iain aura 170 pièces de monnaie - 34 pièces de monnaie = <<170-34=136>>136 pièces de monnaie.