Year 
X 
Y 
Z 

2019 
Quantity 
Price 
Quantity 
Price 
Quantity 
Price 
100 
$1.20 
120 
$2.10 
180 
$3.25 

2020 
$1.44 
$2.23 
$3.88 
 Calculate the consumer price index in the year 2019. Show your calculation.
 Calculate the CPI in year 2020. Show your calculation.