Profit refers to the difference between the total income from commodity sales and the production cost. For 8 steamed buns in 5 yuan, the profit refers to the final amount obtained by subtracting the cost of making 8 steamed buns from 5 yuan money. This cost is actually very complicated. Apart from the cost of raw materials for making eight steamed buns, it also includes store rent, water and electricity, staff salaries, advertising promotion and other cost sharing. Each store is different in these aspects, for example, some stores have high rents, some have low rents, some bosses are good at controlling costs, and some bosses are extravagant. Therefore, the specific profit is uncertain. The pure material cost of 8 steamed buns will not exceed that of 3 yuan.