View Policies Current Attempt in Progress Sheffield Corp. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Purchases Units Unit Cost 9 $70 Sales Units Date July 1 July 6 July 11 July 14 July 21 July 27 - 5 $78 5 $85 (a1) Calculate average cost for each unit. (For calculation and onswers purpose round unit costs to 2 decimal places, e3. 15.25) July 1 $ July 6 $ July 11 $ July 14 5 July 21 $ July 27 $