Sandhill Corp. uses a perpetual inventory system. The company had the following inventory transactions in April: - / 50 April 3 6 7 8 30 Additional information: The cost of the merchandise sold on April 3 was $21,500. The cost of the merchandise returned on April 8 was $2,600.. Whispering Winds uses a perpetual inventory system. Purchased merchandise from Whispering Winds Ltd. for $31,500, terms 2/10, n/30, FOB shipping point. The appropriate company paid freight costs of $600.