$ millions Jan. 31, 2016 Feb. 01, 2015 $40,333 2,216 42,549 $38,223 1,723 39,946 .. Operating assets.. Nonoperating assets Total assets.... Operating liabilities Nonoperating liabilities. Total liabilities.. 14,918 21,315 36,233 13,427 17,197 30,624 6,316 9,322 Total stockholders' equity....... Sales........ Net operating profit before tax (NOPBT).. Nonoperating expense before tax... Tax expense Net income.. 88,519 11,774 753 4,012 7,009 19. Apply DuPont Disaggregation of ROE Refer to the balance sheet and income statement information for Home Depot, from M4-18. a. Compute ROE and disaggregate the ratio into its DuPont components of ROA and financial leverage. b. Disaggregate ROA into profitability and productivity components