A profit margin is the amount of money when you subtract how much money you have made from your product and them subtract how much it took to make the products and your answer would be the profit margin. For example: if I made 50 dollars selling my product, and I made 5 products which costs me one dollar each, to make those five products it would take me 5 dollars so 50-5 equals 45 so my profit margin is 45 dollars, so technically I made 45 dollars.