conversations.from: human
conversations.value: James earns $20 an hour while working at his main job.  He earns 20% less while working his second job.  He works 30 hours at his main job and half that much at his second job.  How much does he earn per week?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: James earns 20*.2=$4 less while working his second job
  So he earns 20-4=$16 an hour
  At his first job he earns 20*30=$600
  He works 30/2=15 hours at his second job
  So he earns 15*16=$240
  So he earns 600+240=$840 a week