Examine changes and percent changes in the line items on the income statement. Comment on significant changes.Calculate the gross profit margin, profit margin, return on assets, and return on equity for all years. Comment on the company's profitability and changes

CONSOLIDATED STATEMENTS OF 12 Months Ended INCOME - USD ($) shares in Millions, $ in Millions Dec. 31, 2021 Dec. 31, 2020 Dec. 31, 2019 Revenue $ 117,929 $ 85,965 $ 70,697 Costs and expenses: Cost of revenue 22,649 16,692 12,770 Research and development 24,655 18,447 13,600 Marketing and sales 14,043 11,591 9,876 General and administrative 9,829 6,564 10,465 Total costs and expenses 71, 176 53,294 46,711 Income from operations 46,753 32,671 23,986 Interest and other income, net 531 509 826 Income before provision for income taxes 47,284 33,180 24,812 Provision for income taxes 7,914 4,034 6,327 Net income $ 39,370 $ 29,146 $ 18,485 Earnings per share attributable to Class A and Class B common stockholders: Basic (in dollars per share) $ 13.99 $ 10.22 $ 6.48 Diluted (in dollars per share) $ 13.77 $ 10.09 $ 6.43 Weighted-average shares used to compute earnings per share attributable to Class A and Class B common stockholders: Basic (in shares) 2,815 2,851 2,854 Diluted (in shares) 2,859 2,888 2,876 Share-based compensation expense included in costs and expenses: Share-based compensation expense included in costs and expenses $ 9,164 $ 6,536 $ 4,836 Cost of revenue Share-based compensation expense included in costs and expenses: Share-based compensation expense 577 447 377 included in costs and expenses Research and development Share-based compensation expense included in costs and expenses: Share-based compensation expense included in costs and expenses 7,106 4,918 3,488 Marketing and sales Share-based compensation expense included in costs and expenses: Share-based compensation expense 837 691 569 included in costs and expenses General and administrative Share-based compensation expense included in costs and expenses: Share-based compensation expense included in costs and expenses $ 644 $ 480 $ 402