On a particular day, the S&P 500 futures settlement price was 899.30. You buy one contract at the settlement price at around the close of the market. The next day the contract opens at 899.70, and the settlement price at the close of the day is 899.10. Determine the value of the futures contract at the opening, an instant before the close, and after the close. Remember that the S&P futures contract has a $250 multiplier.