conversations.from: human
conversations.value: Explain how to solve this math problem: 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?
conversations.from: assistant
conversations.value: His car depreciated 18000-6000=$12000
  So he made a profit of 30000-12000=$18000