conversations.from: human
conversations.value: A store ordered 300 more than twice as many pens as it did pencils at $5 each. If the cost of a pencil was $4, and the store ordered 15 boxes, each having 80 pencils, calculate the total amount of money they paid for the stationery.
conversations.from: assistant
conversations.value: If the store ordered 15 boxes, each having 80 pencils, they ordered 15*80 = 1200 pencils.
  If the cost of a pencil was $4, the store paid $4*1200 = $4800 for all the pencils.
  Twice as many pens as pencils that the store ordered are 2*1200= 2400
  If A store ordered 300 more than twice as many pens as it did pencils, it ordered 2400+300= 2700 pencils.
  Since the cost of the pens was $5, the store paid 2700*$5 = $13500 for the pens.
  The total amount of money they paid for the stationery is 13500+4800 = $18300