Which of the Following Formulas Is Used to Calculate the Inflation

Which of the following formulas is used to calculate the inflation rate?

A) inflation rate $=100 \times\left(\frac{\text { CPI in current year }}{\text { CPI in base period }}\right)$

B) inflation rate $=100 \times\left(\frac{\text { CPI in previous year }}{\text { CPI in current year }}\right)$

C) Inflation rate $=100 \times\left(\frac{\text { CPI in base year }}{\text { CPI in current year }}\right)$

D) Inflation rate $=100 \times\left(\frac{\text { CPI in current year-CPI in previous year }}{\text { CPI in previous year }}\right)$

E) Inflation rate $=100 \times\left(\frac{C P I \text { in previous year-CPI in current year }}{\text { CPI in current year }}\right)$