conversations.from: human
conversations.value: Jeff orders a Halloween costume.  He has to put in a 10% deposit and then pay the rest when he picks it up.  The costume is 40% more expensive than last year's costume, which cost $250.  How much did he pay when picking it up, in dollars?
  Solve this problem.
conversations.from: assistant
conversations.value: It cost 250*.4=$100 more than his old costume
  So it cost 250+100=$350
  He left a 350*.1=$35 deposit
  So he had to pay 350-35=$315