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Sum becomes a multiple or SI becomes a fraction of the sum in t years: rate

This type of question, asked 8 times: 17 Jul 2023 S4, 20 Jul 2023 S1, 21 Jul 2023 S2, 24 Jul 2023 S1, 26 Jul 2023 S1, 12 Sep 2024 S2, 23 Sep 2024 S2, 25 Sep 2024 S1. All 8 questions below, oldest first.

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  1. Question 1

    17 Jul 2023 S4

    69
    Money was lent on simple interest. After 12 years, its simple interest becomes 35\frac{3}{5} of the money. Find the rate of interest.

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  2. Question 2

    20 Jul 2023 S1

    73
    A sum of money becomes 87\frac{8}{7} of itself in 2 years at a certain rate of simple interest. The rate per annum is:

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  3. Question 3

    21 Jul 2023 S2

    56
    A person borrowed some money on simple interest. After 4 years, he returned 95\frac{9}{5} of the money to the lender. What was the rate of interest?

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  4. Question 4

    24 Jul 2023 S1

    72
    The rate at which a sum becomes four times of itself in 12 years at simple interest will be:

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  5. Question 5

    26 Jul 2023 S1

    75
    At what rate percent per annum simple interest, a sum of money triples itself in 16 years?

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  6. Question 6

    12 Sep 2024 S2

    52
    A person borrowed some money on simple interest. After 4 years, he returned 95\frac{9}{5} of the money to lender. What was the rate of interest?

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  7. Question 7

    23 Sep 2024 S2

    60
    The simple interest on a sum for 8 years is three-fifth of the sum. The rate of interest per annum is:

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  8. Question 8

    25 Sep 2024 S1

    63
    The simple interest on a sum for 6 years is three-fifth of the sum. The rate of interest per annum is:

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