The following information ($ in millions) comes from a recent annual report of Amazon.com, Inc.: Net sales $10,778 Total assets 4,408 End of year balance in cash 1,035 Total stockholders' equity 395 Gross profit (Sales Cost of Sales) 2,540 Net increase in cash for the year 29 Operating expenses 2,050 Net operating cash flow 720 Other income (expense), net (17) Compute Amazon's total liabilities at the end of the year. Multiple Choice