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

### Instruction:
Carrie wants to buy a new iPhone. The new iPhone costs $800. She can trade in her Samsung Galaxy for $240. She can make $80 per week babysitting. How many weeks does she have to work before she can purchase the iPhone?

### Response:
 ราคาทั้งหมดของ iPhone จะเป็น $800 - $240 = $<<800-240=560>>560
เธอจะต้องทำงาน  $560 / $80 = <<560/80=7>>7 สัปดาห์เพื่อหารายได้เพียงพอ.