/kloc-The price of 0/00 serving of fast food ranges from 350 to 400 yuan. The cost of box lunch is not very high, about 35% to 40% of the selling price. First of all, it depends on the specifications of the box lunch. A box lunch of 20 yuan costs 2000 yuan for one hundred copies, and the cost is between 700 and 800 yuan. The specifications of the box lunch are even lower, one serving 10 yuan, so the cost of one hundred servings is between 350-400 yuan.