conversations.from: human
conversations.value: Tony paid $7 for 2 dozen apples and 1 bunch of bananas. Arnold paid $5 for 1 dozen apples and 1 bunch of bananas. How much does a bunch of bananas cost?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: Tony paid $7-$5= $2 more than Arnold
  We know he bought the same number of bananas as Arnold but that he bought 2-1=1 dozen apples more than Arnold
  Therefore a dozen apples should cost $2
  If Arnold paid $5 and $2 for a dozen apples then the bunch of bananas cost $5-$2=$3