conversations.from: human
conversations.value: Tom has a job mowing lawns around his neighborhood. Each month he spends $17 on gas and mows 3 lawns, charging $12 per lawn mowed.  Last month he also made extra money pulling weeds for $10.  How much profit did Tom earn last month?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: Tom earns 3 lawns * $12 per lawn = $36 per month.
  Tom earned $36 + $10 = $46 last month.
  Tom's profit last month was $46 - $17 gas money = $29.