Could you solve clearly? Thanks a lot!!

1. On November 1, 2010, Cahill Stationers purchased 100 pounds of linen paper at $2.50 per pound from the Northwest Paper. Northwest's credit terms are 2/10, net 30. Cahill remitted payment to Northwest on November 5. Cahill uses a perpetual inventory system. After both these transactions, Cahill would have recognized a a. $245 increase in its purchases account. b. $250 increase in its purchases account. $245 increase in its inventory account. $250 increase in its inventory account. e. $255 increase in its inventory account