On this issue, first of all, we should know that the profit provided by each category is different. For example, the profit rate of eggs and dry goods is very different, and there is also a brand, and the profit rate of famous brands and non-famous brands is different, so we can't talk about what kind of situation it is when we purchase goods. Specific to Master Kong green tea, the purchase price generally ranges from 2 to 2.2 yuan, and the price is around 2.5 yuan.