Wittmann Co. began operations on July 1. It uses a perpetual Inventory system. During July, the company had the following purchases and sales. Purchases Units Unit Cost Sales Units Date uly 1 July 6 July 11 July 14 July 21 July 27 $122 $136 $147 Calculate the average cost per unit at July 1, 6, 11, 14, 21 & 27. (Round answers to 2 decimal places, e.g. $10s.so.) Average cost for each unit July 1 July 6 July 11