How can cpi 3.41 and Wpi 3.54 be interpreted? I know that cpi gives the inflation rate but what is it that we understand from these figures?
In itself, a price index for single period does not tell you much, as any index is, by definition, without dimension. Assuming that 3.41 is the annual change in the CPI (= Consumer Price Index), this would imply an inflation rate of 3.41%. To be specific, it implies that the total price of a representative commodity basket changed by 3.41%. The WPI (= Wholesale Price Index) covers different commodities and hence yields a different inflation rate. Which one to prefer depends on what you are interested in. Consumer Prices are more relevant to private households, but businesses care about wholesale prices.