On May 11, 2023, Wilson Purchasing purchased $24,000 of merchandise from Happy Sales; terms 3/10, n/90, FOB Happy Sales. The cost of the goods to Happy was $19,000. Wilson paid $1,400 to Express Shipping Service for the delivery charges on the merchandise on May 11. On May 12, Wilson returned $3,800 of goods to Happy Sales, which restored them to inventory. The returned goods had cost Happy $3,000. On May 20, Wilson mailed a cheque to Happy for the amount