-15E Bridgeport Furniture Ltd. uses a perpetual inventory system and has a beginning inventory, as at June 1, of 500 bookcases at a cost of $124 each. During June, the company had the following purchases and sales of bookcases: Purchases Sales Date Units Unit cost Units Unit price June 6 1.250 $126 10 1.040 $193 14 1,790 127 16 1.610 198 26 990 128