Littleton Books has the following transactions during May. May 2 Purchases books on account from Readers Wholesale for $2, 500, terms 2/10, n/30. May 3 Pays cash for freight costs of $120 on books purchased from Readers. May 5 Returns books with a cost of $250 to readers because part of the order in incorrect May 10 Pays the full amount due to readers. May 30 sells all books purchased on May 2 less those returned on May 5) for $3, 200 on account