(in $ millions) The following information is provided for Nguyen Company and Northwest Corporation. Nguyen Company Northwest Corporation Net income 2017 $165 $420 Net sales 2017 1,650 4,900 Total assets 12/31/15 1,000 2,400 Total assets 12/31/16 1,050 3,000 Total assets 12/31/17 1,150 4,000 What is Northwest's return on assets for 2017? Show all calculations