Nucor Corporation produces steel and steel products at its eight mills and is a major recycler of scrap metal. The following data relate to Nucor for four years. Nucor Corporation in millions 2011 2012 2013 2014 Total assets $14,570.4 $14, 152.1 $15,203.3 $15,615.9 Common stockholders equity 7,885.4 8,075.1. 7,706.6 7,910.3 3,660.1 4,409.9 Total debt 4,282.0 4,584.4 Sales 19,429.3 19.052.0 21,105.1 Net income 593.1 585.5 815.8 162.4 Interest expense 146.9 169.3 Income tax rate 0.37 0.37 0.37