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

### Instruction:
Percy wants to save up for a new PlayStation, which costs $500. He gets $200 on his birthday and $150 at Christmas. To make the rest of the money, he's going to sell his old PlayStation games for $7.5 each. How many games does he need to sell to reach his goal?

### Response:
 เพอร์ซีเหลือเงินอีก 500-200-150 = 150 เหรียญที่ต้องหารายได้อีก
เขาต้องขายเกม 150/7.5 = 20 เกมเพื่อให้ได้เงินตามเป้าหมาย