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

### Instruction:
Zoe wants to go on the field trip to Washington DC with her middle school this spring and the cost is $485. Her grandma gave her $250 toward her fees and she must earn the rest by selling candy bars. She makes $1.25 for every candy bar she sells. How many candy bars does Zoe need to sell to earn the money for the trip?

### Response:
 เนื่องจากยายของโซอี้ให้เงินเพื่อช่วยค่าใช้จ่าย โซอี้จึงต้องหาเงินเพิ่มอีก $485 - $250 = $<<485-250=235>>235
นั่นหมายความว่าเธอต้องขายแท่งลูกอม $235 / $1.25/แท่งลูกอม = <<235/1.25=188>>188 แท่งลูกอม.