An investor wrote a $45 call option and bought a $50 put option, both of which had the same time to expiration. On the transaction date, the stock price was $45, and the prices for the call and put options were $8 and $10, respectively. Subsequently, the stock price fell by $10, where it remained through the option expiration date. As of the expiration date, the total profit on the combined option position, ignoring commissions and other transactions, is