a. Prepare a vertical analysis of the two income statements. Round percentages to one decimal place. Amazon.com, Inc. Income Statements For the Years Ended December 31 (in millions) Year 2 Year 1 Amount Percent Amount Percent Revenues: Product sales $94,665 % $79,268 % Service sales 41,322 % 27,738 % Total revenues $135,987 % $107,006 96 % Operating expenses: Cost of sales $(88,265) % $(71,651) % Fulfillment (17,619) % (13,410) % Marketing (7,233) % (5,254) % Technology and content (16,085) % (12,540) % General and administrative (2,432) % (1,747) % Other operating expense (income), net (167) % (171) % Total operating expenses Operating income $(131,801) % $(104,773) 96 $4,186 % $2,233 %