Hiiiiii, could you please help me with this economic question?

Consider the following table: 2017 2018 2019 2020 CPI 100 80 120 105 Inflation rate 0% ? a) Fill in the blanks by calculating the inflation rate in 2018, 2019, and 2020. Show your work. (3 marks) b) In which year did Inflation occur? (1 mark) c) In which year did Deflation occur? (1 mark) d) In which year did Disinflation occur? (1 mark) e) Explain why Inflation is more problematic than Disinflation? (6 marks)