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Simple interest is a fraction of the principal (or sum becomes k times) in n years: find the rate

This type of question, asked 2 times: 6 Mar 2023 Tier II, 7 Mar 2023 Tier II. All 2 questions below, oldest first.

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  1. Question 1

    6 Mar 2023 Tier II

    13
    In 5 years, the simple interest on an amount of Rs. X is 25th\frac{2}{5}^{th} of the principal. The rate of interest per annum is:

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  2. Question 2

    7 Mar 2023 Tier II

    27
    A sum triple itself in 9 years at simple interest. Find the rate of interest per annum is.

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