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

### Instruction:
 James needs to get a new pair of glasses. His frames cost $200 and the lenses cost $500. Insurance will cover 80% of the cost of lenses and he has a $50 off coupon for frames. How much does everything cost?


### Response:
 L'assurance couvre 500 * 0,8 = 400 $.
Les montures coûtent 200 - 50 = 150 $.
Donc, il paie 500 - 400 = 100 $ pour les verres.
Ajouté au coût des montures, il paie 100 + 150 = 250 $ au total.