Final answer:
The Consumer Price Index (CPI) is calculated through door-to-door surveys, where government statisticians collect price data by visiting households and recording the prices of a fixed basket of goods and services.
Step-by-step explanation:
The Consumer Price Index (CPI) is a tool used to measure inflation. It is calculated through door-to-door surveys, where government statisticians collect price data by visiting households and recording the prices of a fixed basket of goods and services. The collected data is then used to calculate the CPI.