Kalihi Merchandising 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 n/15, 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,