Construction - Calculating CPI

Statistics New Zealand CPI - Dairy Products Price Index

Price Expenditure
Item


(1)
Base
quantity
E0/P0= Q0
(2)
Base
$
P0
(3)
Current
$
Pt
(4)
Price
relative

(5)
Base
$
P0Q0=E0
(6)
Current
$
PtQ0
(7)
Total expenditure
in base period
%
(8)
Milk 7.5 1.20 1.70 1.417 9.00 12.75 38%
Butter 3.3 1.90 1.70 0.895 6.27 5.61 26%
Yoghurt 4.0 0.85 0.90 1.059 3.40 3.60 14%
Cheese 0.7 7.50 8.00 1.067 5.25 5.60 22%
Total Expenditure 23.92% 27.56% 100%
Index Number 1000 1152

Source: Dairy Products Price Index Statistics New Zealand.