Bramble Furniture Ltd. uses a perpetual inventory system and has a beginning inventory, as at June 1, of 490 bookcases at a cost of $131 each. During June, the company had the following purchases and sales of bookcases: Purchases Sales Date Units Unit cost Units Unit price June 6 1.200 $133 10 1.050 $197 14 1,740 134 16 1,630 202 26 1,030 135 Gross profit Gross profit margin I %