Access the Form 10-K Annual Report for the year ended December 31, 2020 for Alphabet Inc. at the SEC's EDGAR database for financial reports www.sec.gov SEC.gov | Company Search Page and from the Company's 2020 financial statements derive the following (show your work, dollars are in millions and round ratios to two decimal points. Identify the Form 10K page number and specific financial statement from which you derived this information):

A. Net working capital

B. Gross profit

C. Free cash flow

D. Debt ratio