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If the consumer price index was 166.6 in one year and 172.2 in the next year, then the rate of inflation from one year to the next was:

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The formula to find the inflation or deflation rate is (P2-P1)/P1 x 100%, therefore you get 172.2-166.6 divided by 166.6, giving you the inflation rate of 3.36 rounded to two decimal places.
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