Tamarisk, Inc. 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 11 $70 July 6 8 July 11 7 $80 July 14 7 July 21 9 $85 July 27 8 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 $ 1 July 14 $ July 21 $ July 27 $