Problem 6-09A a1-a2, b (Part Level Submission) Ivanhoe 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 $138 Sales Units $152 July July July July July July 1 6 11 14 21 27 $163 (al) Calculate the average cost per unit at July 1, 6, 11, 14, 21 & 27. (Round answers to 2 decimal places, e.g. $105.50.) Average cost for each unit July 1 July 6 July 11 July 14 July 21 July 27