Each bag makes a profit of 8-4=$<<8-4=4>>4

So he makes a total profit of 30*4=$<<30*4=120>>120

# Answer

120
Question:
John buys bags of popcorn for $4 and sells them for $8.  How much profit does he get by selling 30 bags?
Answer:
Let's think step by step.

user
120
John buys bags of popcorn for $4 and sells them for $8.  How much profit does he get by selling 30 bags?
train