The following information ($ in millions) comes from a recent annual report of Amazon.com, Inc.: Net sales Total assets $10,763 4,380 End of year balance in cash 1,136 Total stockholders' equity 455 Gross profit (Sales - Cost of Sales). 2,605 Net increase in cash for the year 13 Operating expenses 2,065 Net operating cash flow 633 Other income (expense), net (18) Compute the income before income tax for Amazon