On February 10, there are 100 trades in a particular futures contract. This means that for the 100 trades, there are 100 long positions and 100 short positions. Of the 100 long positions, 30 are used to close out traders' existing positions and 70 are new positions. Of the 100 short positions, 60 are used to close out traders' existing positions and 40 are new positions. At the end of the day, the open interest in the futures contract by