4.10 Calculating ROA and Its Components. Nucor, a steel manufacturer, reported a net income for 2008 of $1,831 million on sales of $23,663 million. Interest expense for 2008 was $135 million, and noncontrolling interest was $314 million for 2008. The income tax rate is 35%. Total assets were $9,826 million at the beginning of 2008 and $13,874 million at the end of 2008. Compute the rate of ROA for 2008 and disaggregate ROA into profit margin for ROA and assets turnover components