old_contents: class Commission(object):
      def __init__(self, locks, stocks, barrels):
          self.locks = locks
          self.stocks = stocks
          self.barrels = barrels
  
      @property
      def bonus(self):
          if self.locks == -1:
              return "Terminate"
  
          if self.locks < 1 or self.locks > 70:
              return "Invalid"
          elif self.stocks < 1 or self.stocks > 80:
              return "Invalid"
          elif self.barrels < 1 or self.barrels > 90:
              return "Invalid"
  
          sales = self.locks * 45 + self.stocks * 30 + self.barrels * 25
  
          if sales >= 1800:
              return 220 + 0.2 * (sales - 1800)
          elif sales >= 1000:
              return 100 + 0.15 * (sales - 1000)
          else:
              return 0.1 * sales
new_contents: class Commission(object):
      def __init__(self, locks, stocks, barrels):
          self.locks = locks
          self.stocks = stocks
          self.barrels = barrels
  
      @property
      def bonus(self):
          if self.locks == -1:
              return "Terminate"
  
          if self.locks < 1 or self.locks > 70:
              return "Invalid"
          elif self.stocks < 1 or self.stocks > 80:
              return "Invalid"
          elif self.barrels < 1 or self.barrels > 90:
              return "Invalid"
  
          sales = self.locks * 45 + self.stocks * 30 + self.barrels * 25
  
          if sales >= 1800:
              return 220 + 0.2 * (sales - 1800)
          elif sales >= 1000:
              return 100 + 0.15 * (sales - 1000)
          else:
              return 0.1 * sales
  
subject: Fix PEP8: W292 no newline at end of file