Problem 6-09A al-a2, b (Part Level Submission) Carla Vista Co. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Date Units Purchases Unit Cost $160 Sales Units July 1 July 6 July 11 July 14 July 21 $174 $185 July 27 (al) Your answer is partially correct. Try again. Calculate the average cost per unit at July 1, 6, 11, 14, 21 & 27. (Round answers t Average cost for each unit July 1 160 July 6 160 July 11 July 14 July 21 July 27