The following transactions are the only ones made during the first 4 days of trading in a futures contract.

DAY TRANSACTION

1 A long 50, B short 50

2 A long 80, C short 80

3 A long 20, D short20

4 C long 70, A sells 40, B sells 30

What is the open interest on these 4 days?

		50, 130, 150, 180
		None of the given answers are correct
		50, 130, 150, 190
		50, 130, 150, 110
		50, 80, 20, 70