View Policies Current Attempt in Progress Martinez Furniture Ltd, uses a perpetual inventory system and has a beginning inventory, as at June 1 of 490 bookcases at a cost of $126 each. During June, the company had the following purchases and sales of bookcases: Purchases Units Unit cost 1.210 $128 Sales Unit price Date June Units 6 10 1,050 $206 1.850 129 14 16 1,520 211 26 1,020 130