Plank Co. uses the conventional retail inventory method. The following information is available for the current year. Cost Retail Beginning inventory $ 312,000 $488,000 Purchases Freight-in Net markups Net markdowns 1,180,000 1,660,000 20,000 60,000 80,000 Sales revenue 1,568,000 The ending inventory at retail should be: $640,000 O $600,000. $576,000. O $560,000.