C) Consumer Price Index (CPI)
CPI: The government periodically record the average price increase of the most popular goods and services ( the basket of goods) purchased within an economy. Then, that is then calculated to get the inflation rates.
——-
197197 - 188188 = 9009
(-) 9009 / 188188 = -0.04787....
-0.04787 x 100 = - 4.8%
It’s actually deflation over 2008-2009