An investor has purchased an asset-or-nothing put option on a lot of 5,000 shares of KRP stock, with the stock currently trading at USD 52 per share. This particular option has a strike price of USD 49 and expires in one month. If at the time of the option's expiration the stock price declines to USD 45, what would be the correct calculation to determine the payoff for this asset-or-nothing put option contract?