In 2019, 10%, 20%, and 20% of students who appeared in exams P, Q, and R cleared the respective exams while in 2020 percentage for the same was 20%, 10%, and 40%. How many students cleared all three exams in these two years?

• A. 1556
• B. 1560
• C. 1576
• D. 1545
• E. None of the above