Consumer price index (CPI)� is one of the most commonly used and widely understood indexes available.trend index numbers are calculated for each year by dividing the average check for each year by the average check for Year 1 and multiplying by 100.
Consumer price index (CPI)� is one of the most commonly used and widely understood indexes available.trend index numbers are calculated for each year by dividing the average check for each year by the average check for Year 1 and multiplying by 100.
