Indigo Corporation began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. 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 $ _____________ July 14 $ _____________ July 21 $ _____________ July 27 $ _____________