Assume on Tuesday, Oct 2, there were 4,500 trades in a particular futures contract. This means there were 4,500 traders took a long position and 4,500 took a short position. Of the 4,500 buyers, 3,150 were closing out positions and 1350 were entering new positions. Of the 4,500 sellers, 2700 were closing out positions and 1800 were entering into new positions. How this days trading activity will affect the open interest?