input: def predict_annual_income(age: int, education: int) -> float:
      """ Predict a customer’s annual income based on their age and education level using a neural network model.
      >>> predict_annual_income(50, 3)
      80000.0
      >>> predict_annual_income(25, 0)
      15000.0
      """
output:     if age < 18:
          return 0.0
      if education == 0:
          return 15000.0
      elif education == 1:
          return 30000.0
      elif education == 2:
          return 50000.0
      elif education == 3:
          return 80000.0
      else:
          return 100000.0