: QUESTION 3 (1) A fashion brand puts forward an online marketing plan to drive traffic from an overseas social media platform for three periods. According to the plan, the impression is predicted to be 12,000, 8,000 and 10,000 at the different periods with the CTR (click-through rate) of 6%, 10%, and 12%, respectively. If the total budget of such an advertising campaign is $4,000, please calculate the cost for each click. (2) A PC store is holding 2,000 sets of old-model laptops, purchased at $100 and sold at $400. The store owner wants to launch clearance sales for these laptops. The tentative discounts are 30% off, 40% off, 50% off, and 60% off. If the store owner hopes to get $550,000 sales revenue in return, how should he set the sales discount