The following information ($ in millions) comes from a recent annual report of

Amazon.com, Inc.

Net sales.................................................$10,711

Total assets................................................4,363

End of year balance in cash.....................1,022

Total stockholders equity............................431

Gross profit (Sales  Cost of Sales)...........2,456

Net increase in cash for the year 9

Operating expenses.................................2,067

Net operating cash flow.............................702

Other income (expense), net (12)

Requirements:

a. Compute Amazon's balance in cash at the beginning of the year.

b. Compute Amazon's total liabilities at the end of the year.

c. Compute cost of goods sold for the year.

d. Compute the income before income tax for Amazon.