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Bramble 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 10 $66 Sales Units 8 Date July 1 July 6 July 11 July 14 July 21 July 27 $70 Os $74 7 (21) Calculate average cost for each unit. (For calculation and answers purpose round unit costs to 2 decimal places, eg. 15.25.) July 1 $ July 6 $ July 11 $ July 14 $ $ July 21 July 27 $