Inflation/Inflation Rate

Question 1

How can we calculate the inflation rate using CPI?

Answer 1

[CPI(future) - CPI(now)] / (CPI(now)]

Question 2

How can we calculate the inflation rate using the GDP deflator?

Answer 2

[GDP deflator(future) - GDP deflator(now)] / (GDP deflator(now)]

Question 3

How can we calculate the real economic growth?

Answer 3

[Real GDP(future) - Real GDP(now)] / (Real GDP(now)]