1. CPI per basket
Consumer price index (CPI) refers to a measure of an economy’s general price. During a base year, the value of CPI equals to 100 with the CPIs in all the other years in relation to the base year.
In order to calculate the CPI per basket, we first need to find the total value of the CPI basket. In this case the CPI basket for 2009 is;
$60 + $30= $ 90.
The number of units of juice in the CPI basket in 2009 is the total amount spent by consumers divided the cost per bottle. That is, units in 2009 are;
$60/$2= 30 units of bottles for juice
$30/$5= 6 meters for cloth
Thus, in 2010 when the price of juice increases to $4 in 2010, and price of cloth to $6, the amount that average household will spend on juice and cloth respectively is;
30 bottles x $4= $120.
6meters x $6= $36
Thus, in 2010, the CPI basket is;
$120 + $36= $156
Thus, CPI in 2010= (CPI in 2010/CPI in 2009) x 100
= $156/90 x100
= 173.3
2. The inflation rate
Inflation rate equals to change in percentage in the CPI
($156-$90)/$90 x 100
73.3%
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