A company makes electronic gadgets.  One out of every 50 gadgets is faulty, but the company doesn't know which ones are faulty until a buyer complains.  Suppose the company makes a $2 profit on the sale of each working gadget, but suffers a loss of $90 for every faulty gadget because they have to repair the unit under warranty.  How much can the company expect to make (or lose) per unit in the long run? 

Please enter a number only.  Use a minus sign if the number represents a loss, but do not use dollar signs, words, etc.