We could say that when the consumer price index was 237.0 in 2015 and 251.1 in 2018 tuition at a community college has remained constant and increased at exactly the same rate as inflation. The correct option is a.
Consumer price index refers to a price index, the price of a weighted average market basket of consumer goods and services purchased by households. Changes in measured consumer price index track changes in prices over time. It is a statistical estimate constructed using the prices of a sample of representative items whose prices are collected periodically.
The consumer price index is also known as CPI.
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