I need to calculate the Return on Assets which is earning without interest expense divided by average assets, and I need the profit margin which is earning without interest expense divided by sales revenue. I don't understand what is earning without interest expense means, please answer if you know don't guess or right net income divided by sales revenue because it's not correct. I included a photo for the balance sheet.

(S millions) Best Buy Kroger Nordstrom Staples Walgreen Sales revenue $52,705 $92,374 $12,877 $27,022 $74,184 Cost of sales 6,692 18,380 51,792 38,213 71,594 Interest expense 134 435 132 174 89 2,664 132 656 723 1,024 Net income 897 2,474 2,318 2,030 2,002 Average receivables 2,496 5,914 5,140 1,163 7,811 Average inventories 11,355 14,306 2,394 2,114 Average PP&E 3,647 7,977 13,671 16,927 23,491 26,865 Average total assets