Claire's Wholesale had the following transactions during May:

May 1: Beginning inventory was 20 units valued at $25 per unit.

May 5: Purchased 80 units of merchandise on account for $2,160, terms n15, FOB shipping point.

May 9: Paid transportation cost on the May 5 purchase, $240.

May 10: Returned two units of defective merchandise purchased on May 5.

May 11: Sold 30 units for $50 per unit on account.

May 15: Paid for the May 5 purchase, less the return.

May 20: Sold 10 units for $50 per unit on account.

Required:

Assuming FIFO and that the perpetual inventory system is used, prepare the journal entries to record the above transactions.