3.9 yuan. Potato chips are made by crushing potatoes with a machine, adding a large amount of starch, stirring, setting the shape and frying. Finally, they are packaged in bags or boxes. This is the factory where the potato chips we usually eat are made. The production process can be said to be very simple, but when sold on the market, the price is very expensive. 100 grams requires about 2 potatoes. The price of potatoes is generally only one yuan per catty, and 2 potatoes are less than one catty. Add The cost of packaging, labor, machine wear, etc. is 30%. 100 grams of potato chips sell for 13 yuan, and the cost calculation is 3.9 yuan.