Current assets Long-term assets Current liabilities Long-term debt Common equity 2006 $4,650 7,120 1,440 3,830 6,500 2005 $4,730 6,450 1,340 3,760 6,080 Operating income Interest expense Tax expense (40C) Net income 2.140 240 760 1.140 Assume all assets are operating assets, all current liabilities are operating liabilities Return on asset (ROA) for year 2006 is (choose the closhot answer) 20.41% 9.93% 17.54% 18.12%