Using Facebooks 12/31/2020 10-K and other researched material, answer the questions below in the boxes provided

Year to Year Comparisons	Solution Only in Percent (% to one decimal)
Common Size Income Statement (Partial)	Revenue: 2020 _____ % 2019 _____% Cost of Revenue: 2020 _____ % 2019 _____% Marketing and Sales: 2020 _____ % 2019 _____% Net Income: 2020 _____ % 2019 _____%
In about 3 sentences explain why Marketing and Sales Expense changed from 2019 to 2020.