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

### Instruction:
Twenty people pre-bought plane tickets at a price of $155 per ticket. Thirty people bought their plane tickets at the gate and they each paid $200 for their ticket. How many more dollars did the people at the gate pay for their tickets than those passengers that pre-bought their tickets?

### Response:
 คนที่ซื้อตั๋วที่เกตเกจ่าย 30*200=$6000 เหรียญ
คนที่ซื้อตั๋วล่วงหน้าจ่าย 20*155=$3100 เหรียญ
ดังนั้นคนที่ซื้อตั๋วที่เกตเกจ่ายเงินเพิ่ม 6000-3100=$2900 เหรียญ