Amazon.com, Inc. is the largest Internet retailer in the United States. Amazon’s income statements through income from operations 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 income from operations. 

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