Abc trading co. commenced operations during the year as a large importer and exporter of sundries. the imports were all from one country overseas. the export sales were conducted as drop shipments. abc never actually took possession of the goods, which were merely transshipped at houston. abc trading reported the following data: purchases during the year $15.0 million shipping costs from overseas $1.5 million shipping costs to export customers $1.0 million inventory at year end $3.0 million. what amount of shipping costs should be included in abc trading's year-end inventory valuation?