How to Plan for the Right Product and the Right Keywords

If your net margin is 30% without advertising in there, then you should bake back in a 15% spend on tacos. That would put your net once you put that column back into the P&L at 15%. You will have to spend and most people do spend 80% not tacos, acost. Then you can do the math there as well. How much you will be spending and how much you'll be gaining at the end of the day.