About 70%. Cold salad is very popular all year round, especially in summer. There are many kinds of vegetables with low prices, and there are finished product suppliers, and the profit can be above 70%. Pay attention to the preservation of food when making cold salad in summer, because the shelf life of food in summer is short, and pay attention to the quantity of food made. If you eat too much cold salad, it will not be fresh after a certain period of time.