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

### Instruction:
Bert has a garden shop. He buys his products in a warehouse and sells them for $10 more in his shop. From each sale, he has to pay 10% of the value in tax. One day a client came to his shop and bought a barrel for $90. How Much money did Bert make on this sale?

### Response:
 ลูกค้าจ่าย $90
เบิร์ตซื้อถังในราคา $90 - $10 = $<<90-10=80>>80
ภาษีมีมูลค่าเท่ากับ 10% ของ $90 = $<<90*.1=9>>9
ดังนั้นกำไรของเบิร์ตคือ $90 - $80 - $9 = $<<90-80-9=1>>1