Human: John buys bags of popcorn for $4 and sells them for $8. How much profit does he get by selling 30 bags? Assistant: 
How much profit does each bag make? ** Each bag makes a profit of 8-4=$<<8-4=4>>4
How much profit does John make? ** So he makes a total profit of 30*4=$<<30*4=120>>120
#### 120