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First take a base year. It has to be a normal year when no natural calamity took place and the value decided to all the goods is 100. Changes in the prices are measured as a percentage of the base year prices and then index numbers have to be calculated according to the changes. The answer to the current year is measured with the base year. The increase in the answer of the current year is the inflation rate.

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13y ago
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Q: How do you calculate index numbers?
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