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Price rises r%: percent cut in consumption to keep expenditure the same

The same question, asked 2 times: 19 Jul 2023 S4*, 27 Jul 2023 S1. Every wording below, oldest first.

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  1. Question 1

    19 Jul 2023 S4

    74
    If the price of petrol increased by 7%7\%, then by what percentage should the consumption be decreased by the consumer, if the expenditure on petrol remains unchanged?

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  2. Question 2

    27 Jul 2023 S1

    52
    If the price of petrol is increased by 81%, by what percentage should the consumption of petrol be decreased by the consumer if the expenditure on petrol remains unchanged? (Correct to two decimal places)

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