If the consumer price index is 120 in 2009 and 139.2 in 2010, then the rate of inflation for 2010 is 39.2 percent.

Name: If the consumer price index is 120 in 2009 and 139.2 in 2010, then the rate of inflation for 2010 is 39.2 percent.
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The rate of inflation is calculated as the percentage change in the Consumer Price Index (CPI) from one year to the next. In this case, the calculation would be $\frac{139.2 - 120}{120} \times 100 = 16\%$, indicating a 16% rate of inflation for 2010, not 39.2%.

If the Consumer Price Index Is 120 in 2009 and 139.2