Replace Parameter with Method

An object invokes a method, then passes the result as a parameter for a method. The receiver can also invoke this method.

Remove the parameter and let the receiver invoke the method.

  int basePrice = _quantity * _itemPrice;
  discountLevel = getDiscountLevel();
  double finalPrice = discountedPrice (basePrice, discountLevel);

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  int basePrice = _quantity * _itemPrice;
  double finalPrice = discountedPrice (basePrice);