The cost of one copy of rice rolls is 1 yuan. According to the relevant public information, the cost of a rice rolls is 20 cents, the cost of a packaging box is 2 cents, and the cost of a rice rolls raw material is 50 cents to 60 cents, so the cost of a rice rolls is 1 yuan. Mao rice rolls is a very famous traditional snack of Han nationality in Guangdong, which belongs to Cantonese cuisine and originated from Longzhou (now luoding city, Guangdong) in the Tang Dynasty.