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To measure inflation, subtract last
year's price index from this year's price index and divide
by last year's index; then multiply by 100 to express as a
percentage.
Inflation Rate = [
(Price Index this year - Price Index last year) / Price
Index last year ] x 100
IN rate 2015 = [ (PI 2015 - PI
2014) / PI 2014 ] x 100
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