In this group of data if the 2nd year is the base year, the price index for year 3 is given as 133.
In the field of economics this is the term that is used to talk about the way that price changes over a period of time.
= Cost of basket / cost of basket in base year multiplied by 100
Hence we have
10 × $3 = $30
in the third year
= 10 × $4 = $40
Price index = 40/30 × 100
= 133
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