The proportion of ingredients is calculated by dividing the amount of food by the total sales of the catering enterprise and multiplying it by the percentage.

The ratio of food to total expenditure is Engel's coefficient, and the formula of Engel's coefficient is: the ratio of food expenditure to total expenditure (R1) = the change percentage of food expenditure ÷ the change percentage of total expenditure; In addition to food expenditure, the expenditure on clothing, housing, daily necessities, etc., also shows a decreasing trend after a period of rising proportion in the growing family income or total expenditure.

Method of food proportion coefficient:

The proportion of food in total expenditure is Engel coefficient, and the concept of Engel coefficient is: since food consumption is basic, it will not increase with the increase of income or consumption; Therefore, when the income or consumption of a person or family increases, the percentage of his or her food expenditure in the total consumption will decrease relatively.

You can use the percentage of food expenditure to total consumption (namely Engel coefficient) to judge someone's quality of life; When Engel's coefficient is higher, its quality of life is worse, while when its coefficient is lower, its quality of life is higher.

The descriptions of Engel's coefficient in the above two quotations are obviously different: Dong Wen said it was the ratio of food expenditure to total income, while Mo Wen said it was the percentage of food expenditure to total consumption.