Problem 6-9A Blue Spruce Corp. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Purchases Date Units Unit Cost Sales Units July 1 July 6 July 11 uly 14 July 21 July 27 13 $117 6 $124 8 $133 Calculate average cost for each unit. (For calculation and answers purpose round unit costs to 2 decimal places, e.g. 15.25.) July 1 $ July 6 July 11 uly 14 uly 21 July 27