<human>:  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?
<bot>: What was the total cost of the pre-bought tickets? ** Pre-bought: 20 people * $155 = $<<20*155=3100>>3100
What was the total cost of the tickets bought at the gate? ** Gate bought: 30 people * $200 = $<<30*200=6000>>6000
How many more dollars did the tickets bought at the gate cost than the pre-bought tickets? ** $6000 - $3100 = $<<6000-3100=2900>>2900
How many more dollars did the people at the gate pay for their tickets than those passengers that pre-bought their tickets? ** The passengers that paid at the gate paid $2900 more dollars than those who pre-bought their tickets.
#### 2900