The following information ($ in millions) comes from a recent annual report of Amazon.com, Inc.: Net sales Total assets End of year balance in cash Total stockholders' equity Gross profit (Sales - Cost of Sales) Net increase in cash for the year Operating expenses Net operating cash flow Other income (expense), net $10,825 4,462 1,141 386 2,625 29 2,054 707 (31) Compute Amazon's cost of goods sold for the year