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

### Instruction:
Yulia was able to net $44 in profit this week. Her lemonade stand made a gross revenue of $47 this week. She was also able to babysit and made $31. However, her lemonade stand is expensive to run because she needs to buy lemons, sugar, and sunscreen. How much did she spend to operate her lemonade stand, in dollars?

### Response:
 รายได้สุทธิรวมของยูลียาคือ $47 + $31 = $<<47+31=78>>78
เพื่อคำนวณค่าใช้จ่ายในการดำเนินงาน เราต้องหักกำไรสุทธิออกจากรายได้สุทธิทั้งหมด ซึ่งเป็น $78 - $44 = $<<78-44=34>>34