You recently started a small affiliate marketing service Last month, you spent 1,000 on a Pay-Per-Click (PPC) online advertising campaign that resulted in 1,200 in sales. What was last month's Return on Investment (ROI)for your affiliate marketing service? .2% 120% 20% 80%

To calculate the Return on Investment (ROI) for your affiliate marketing service, we need to use the following formula:<br /><br />ROI = (Net Profit / Cost of Investment) x 100<br /><br />In this case, the net profit is the difference between the sales and the cost of the PPC campaign, which is $1,200 - $1,000 = $200.<br /><br />Now, we can plug the values into the formula:<br /><br />ROI = ($200 / $1,000) x 100<br /><br />Simplifying the expression, we get:<br /><br />ROI = 0.2 x 100<br /><br />Therefore, the ROI for your affiliate marketing service last month is 20%.<br /><br />So, the correct answer is $20\%$.