On February 10, there are 200 trades in a particular futures contract. This means that for the 200 trades, there are 200 long positions and 200 short positions. Of the 200 long positions, 100 are used to close out traders' existing positions and 100 are new positions. Of the 200 short positions, 80 are used to close out traders' existing positions and 120 are new positions. At the end of the day, the open interest in the futures contract increases by Please answer all parts of the