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

### Instruction:
Stella wanted to buy a new dress for the upcoming dance.  At the store she found out that the dress she wanted was $50.  The store was offering 30% off of everything in the store.  What was the final cost of the dress?

### Response:
 ราคาสุดท้ายของเดรสคือ $<<50*0.70=35>>35