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    Question

    Suresh earned an interest of Rs. 774 on principal amount

    of Rs. 2400 at some rate of compound interest in 2 years. How much more/less interest would he have earned on Rs. 2700 at the same rate of simple interest for the same duration?
    A Rs. 48 Correct Answer Incorrect Answer
    B Rs. 45 Correct Answer Incorrect Answer
    C Rs. 33 Correct Answer Incorrect Answer
    D Rs. 39 Correct Answer Incorrect Answer
    E Rs. 36 Correct Answer Incorrect Answer

    Solution

    Let, rate of interest be тАШrтАЩ% per annum So, 774 = 2400 ├Ч {(1 + r/100)2 тАУ 1} 129/400 = {(1 + r/100)2 тАУ 1} 529/400 = (1 + r/100)2 (23/20)2 = (1 + r/100)2 23/20 = 1 + r/100 3/20 = r/100, r = 15 So, simple interest earned = 2700 ├Ч 0.15 ├Ч 2 = Rs. 810 Required amount = 810 тАУ 774 = Rs. 36

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