The specific formula can be found on the Internet, because the CPI of each year is different, because the CPI of last year 100 is the price growth rate of one year compared with the previous year, and the CPI based on 1996 is the cumulative growth rate of the price ratio of one year 1996, so you can refer to the calculation of the cumulative growth rate in the horizontal method of average growth rate.

1. Consumer price index, also known as consumer price index, or CPI for short.

1 is a relative figure reflecting the trend and degree of price changes of consumer goods and services purchased by urban and rural residents in a certain period. It is the result of comprehensive summary calculation of consumer price index of urban residents and rural consumer price index. Through this indicator, we can observe and analyze the impact of changes in retail prices of consumer goods and services on the actual living costs of urban and rural residents.

It is a macroeconomic indicator that reflects the changes in the price level of consumer goods and services that families usually buy. It is a relative figure used to measure the price level of a representative group of consumer goods and services that changes with time in a specific period. Used to reflect the changes in the price level of consumer goods and services purchased by families. It is the change factor of the retail price of goods and services within one month.

2. Consumer price survey is the final price of social products and services. On the one hand, it is closely related to people's lives. At the same time, it also plays an important role in the price system of the whole national economy. It is an important indicator of economic analysis and decision-making, monitoring and regulation of the overall price level and national economic accounting. Its rate of change reflects the degree of inflation or contraction to some extent. Generally speaking, when prices rise comprehensively, relatively and continuously, it is considered that inflation has occurred.

3,2021,10, 18 According to the National Bureau of Statistics, in the first three quarters of 20021,the national consumer price (CPI) rose by 0.6% year-on-year, an increase of 0. 1 percentage point over the first half of the year.

Second, the consumer price index (CPI) is an important macroeconomic indicator reflecting the changes in the price levels of consumer goods and services related to residents' lives. It is also an important indicator of macroeconomic analysis and decision-making and national economic accounting. Generally speaking, the level of CPI directly affects whether the central bank adjusts the national macro-control measures such as interest rate and deposit reserve ratio. At the same time, the level of CPI also indirectly affects the changes of capital markets (such as stock market, futures market, capital market and financial market).

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