Vertical analysis Amazon.com, Inc. is the largest Internet retailer in the United States. Amazons income statements through income from operations for two recent years are as follows (in millions): Amazon.com, Inc. Operating Income Statements For the Years Ended December 31 (in millions) Year 2 Year 1 Product sales $70,080 $60,903 Service sales 18,908 13,549 Total sales $88,988 $74,452 Cost of sales $62,752 $54,181 Fulfillment 10,766 8,585 Marketing 4,332 3,133 Technology and content 9,275 6,565 General and administrative 1,552 1,129 Other operating expense (income), net 133 114 Total operating expenses $88,810 $73,707 Income from operations $178 $745 Required: a. Prepare a vertical analysis of the two operating income statements. Round percentages to one decimal place.