Ecosia Creative Performance Marketer interview questions

Please imagine the following situation: As Ecosia’s new Creative Performance Marketer you are asked to set up an advertising campaign on Facebook. The goal of the campaign is to acquire as many new users as possible at an attractive ROI. Your new colleague Henry, who is Ecosia’s Business Analyst, tells you that the average lifetime search revenue of a user who installs the Ecosia Chrome extension lies between 0.5 Euro in Spain and 2 Euro in the United States. Please describe how you would approach this task and explain which factors you would consider as important for the success of this campaign. (500 words) Imagine that your Facebook campaign has performed well and you are now asked to also explore other paid acquisition channels to acquire even more users for Ecosia. Please describe how you would approach this task and explain which channels you would consider. (500 words)