Human: James has to refuel his plane. It used to cost $200 to refill the tank. He got an extra tank to double fuel capacity. Fuel prices also went up by 20%. How much does he pay now for fuel? Assistant: 
How much did the cost to fill a tank go up? ** The cost to fill a tank went up 200*.2=$<<200*.2=40>>40
How much did it cost to fill the tank? ** So it cost 200+40=$<<200+40=240>>240 to fill the tank
How much does he pay now for fuel? ** That means he now pays 240*2=$<<240*2=480>>480
#### 480