The following are the key financial statement figures from "Faked Pfizer Ltd." from 2020 to 2021. You are asked to analyse the historical performance of Faked Pfizer Ltd. in terms of profitability. In your answer, you should: - Calculate and discuss the change in profitability using ROE. - Calculate and discuss the key drivers that result in the change in profitability using the DuPont system analysis. (Keep your discussion on point and brief. Focus on the interpretation of the ratio and how that affects profitability.)