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    Question

    The compound interest earned on an investment of Rs. 'Y'

    over 2 years at an annual compound interest rate of 12%, compounded yearly, amounts to Rs. 1,272. Determine the interest earned on an investment of Rs. 12,800 over 3 years at a simple interest rate of 15% per annum.
    A Rs. 1.21Y Correct Answer Incorrect Answer
    B Rs. (1.1Y + 260) Correct Answer Incorrect Answer
    C Rs. (1.1Y - 260) Correct Answer Incorrect Answer
    D Rs. (0.8Y + 1240) Correct Answer Incorrect Answer
    E Rs. (Y + 680) Correct Answer Incorrect Answer

    Solution

    Compound interest earned on investing Rs. тАШYтАЩ = Y ├Ч {1 + (12/100)┬▓ } тАУ Y So, Y ├Ч {1 + (12/100)┬▓ } тАУ Y = 1272 Or, 1.2544Y = 1272 + Y Or, 0.2544Y = 1272 So, Y = 1272 ├╖ 0.2544 = 5000 Simple interest earned on investing Rs. 12,800 = 12800 ├Ч 3 ├Ч 15 ├╖ 100 = Rs. 5,760 = 5500 + 260 = (1.1Y + 260)

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