An investor believes that XYZ stock will decline in the upcoming 6 months and buys a put option at a strike price of $40. The stock is currently trading at $42 a share. The investor pays $3 a share for the premium. Assume XYZ goes bankrupt and the stock becomes worthless prior to the expiring put option. Based on your assigned reading from Chapter 15 on protective puts, calculate the potential gain or loss of the buyer of this protective put?