Amazon.com, Inc. is the largest Internet retailer in the United States. Amazon’s income statements through operating income for two recent years are as follows (in millions):

a. Prepare a vertical analysis of the two operating income statements. Round percentages to one decimal place.
b. Use the vertical analysis to explain the decrease in operating income.

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Amazon.com, Inc. Operating Income Statements Forthe Years Ended December 31 (In millons) Year 2 Year 1 Product sales . $141,915 $118,573 Service sales. . 90,972 59,293 $177,866 $111,934 25,249 10,069 22,620 3,674 Total sales... $232,887 $139,156 34,027 13,814 28,837 4,336 Cost of sales. . Fulfillment. . Marketing . . Technology and content. General and administrative .. Other operating expense, net... Total operating expenses... Operating income 296 214 $173,760 $ 4,106 $220,466 $ 12,421