Answer:
D. by determining the percentage change in the price index from the preceding period.
Explanation:
Inflation rate -
Consumer price index , is the average of all the good's price .
Inflation is the overall increase in the value of the Consumer Price Index ( CPI ) .
Inflation rate , is the percentage increase in the vale of the CPI with respect to the previous year .
Hence , the correct statement for the inflation rate is option ( D. ) .