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SI on the same sum for a new rate or time by proportion

This type of question, asked 3 times: 24 Jul 2023 S3, 24 Sep 2025 S3, 26 Sep 2025 S2. All 3 questions below, oldest first.

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  1. Question 1

    24 Jul 2023 S3

    65
    The interest on a certain deposit at 4.5% p.a. is ₹135 in one year. How much will the additional interest in one year be on the same deposit at 5% p.a.?

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  2. Question 2

    24 Sep 2025 S3

    52
    What will the ratio be of the simple interest earned on a given amount at the same interest rate over 6 years compared to that earned over 9 years?

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  3. Question 3

    26 Sep 2025 S2

    52
    If the simple interest on a certain sum of money for 4 years at 5%5\% per annum is ₹500, what would be the simple interest on the same sum for 6 years at 7%7\% per annum?

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