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    Question

    A sum of Rs. 9,600 earns a simple interest of Rs. 1,920

    in 2 years at a certain annual rate. What will be the simple interest on Rs. 12,000 for 4 years at the same rate?
    A Rs.1,200 Correct Answer Incorrect Answer
    B Rs.4,800 Correct Answer Incorrect Answer
    C Rs.2,250 Correct Answer Incorrect Answer
    D Rs.2,630 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the rate of interest be 'R%' p.a. ATQ, 9600 × (R/100) × 2 = 1920 ⇒ R = 1920 ÷ 192 = 10 Now, required interest = 12000 × (10/100) × 4 = 12000 × 0.4 = Rs. 4,800

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