Therefore, difference in price index between period 3 and 4 is :
140 - 125 = 15
Lastly, 15/125 * 100 = 12%
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Consumer Price Index (CPI)
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If the price index is $225 that means that the item or items in
question averages about $225 for price. This can measure one item
or a group of items. Price index is the average cost on the market
for items.