His car depreciated 18000-6000=$<<18000-6000=12000>>12000

So he made a profit of 30000-12000=$<<30000-12000=18000>>18000

# Answer

18000
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Without factoring in the cost of depreciation for his car John made $30,000 doing Uber.  When he finally traded in the car he bought for $18,000 he got $6000 back.  What was his profit from driving Uber?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
18000
Without factoring in the cost of depreciation for his car John made $30,000 doing Uber.  When he finally traded in the car he bought for $18,000 he got $6000 back.  What was his profit from driving Uber?
train