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Cost or selling price changes and the profit changes: original profit percent or the change

This type of question, asked 3 times: 17 Jul 2023 S4, 12 Sep 2024 S3, 23 Sep 2025 S2. All 3 questions below, oldest first.

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  1. Question 1

    17 Jul 2023 S4

    55
    If the selling price of an article is doubled, then the profit becomes four times. What was the original profit percentage?

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  2. Question 2

    12 Sep 2024 S3

    69
    The profit gained on selling a certain product is 320%320\% of the cost. If the cost increases by 10%10\% but the selling price remains constant, then what percentage of the selling price is the profit (correct to one decimal place)?

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  3. Question 3

    23 Sep 2025 S2

    62
    If the selling price of an item is increased by 25% and the profit also increases from 20% to 30%, what is the percentage increase in the cost price?

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