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Two successive percentage changes: net percent change

The same question, asked 3 times: 25 Jul 2023 S3*, 10 Sep 2024 S2*, 11 Sep 2024 S2. Every wording below, oldest first.

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  1. Question 1

    25 Jul 2023 S3

    71
    In the first month, the income of Mohan increases by 30%. In the second month his income decreases by 30%. What will be percentage increase or decrease in the income after two months?

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  2. Question 2

    10 Sep 2024 S2

    65
    Ravi's salary was increased by 50%50\%. After some time, his new salary was also increased by 50%50\%. Find his gain percentage of salary.

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  3. Question 3

    11 Sep 2024 S2

    70
    The salary of a worker is first increased by 25%, then it is decreased by 12%. The percentage change in his salary is:

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