conversations.from: human
conversations.value: I need help with this problem:
  Mark constructed a deck that was 30 feet by 40 feet.  It cost $3 per square foot.  He then paid an extra $1 per square foot for sealant.  How much did he pay?
conversations.from: assistant
conversations.value: The deck is 30*40=1200 square feet
  He pays 3+1=$4 per square foot
  So he paid 1200*4=$4800