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Whispering Winds Corp. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Date July 1 July 6 July 11 July 14 July 21 July 27 Purchases Units Unit Cost 9 4 s $79 $84 S91 Sales Units 6 4 4 Whispering Winds Corp. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Date July 1 July 6 July 11 July 14 July 21 July 27 Purchases Units Unit Cost 9 4 s $79 $84 S91 Sales Units 6 4 4