Percentage distribution in two years with year totals: change in a category

This type of question, asked 2 times: 26 Jul 2023 S2, 26 Sep 2024 S1. All 2 questions below, oldest first.

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Question 1
26 Jul 2023 S2
72 $The following table shows the percentage distribution of employees in five different departments 1-5 in a company during the years 2020 and 2021. The total number of employees in 2020 and 2021 is 1200 and 1600, respectively. Year Department 1 Department 2 Department 3 Department 4 Department 5 2020242120191620212122181920 In which department is the variation in strength of employees maximum in 2021 in comparison to that in 2020?$
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Question 2
26 Sep 2024 S1
72 $Study the given table and answer the question that follows. The following table shows the percentage distribution of students in four different schools during the years 2021-22. Year School 1 School 2 School 3 School 4 202128252423202227282322 If there was a total number of 16,000 and 18,000 students during the years 2021 and 2022 respectively, then the difference in number of students in school 4 in 2022 with respect to 2021 is:$
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Year	Department 1	Department 2	Department 3	Department 4	Department 5
2020	24	21	20	19	16
2021	21	22	18	19	20

Year	School 1	School 2	School 3	School 4
2021	28	25	24	23
2022	27	28	23	22

Question 1