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    Question

    An amount becomes six times of itself in 50 years at

    simple interest. Find the value of (2R + 30).
    A 70 Correct Answer Incorrect Answer
    B 30 Correct Answer Incorrect Answer
    C 45 Correct Answer Incorrect Answer
    D 50 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the amount invested be Rs. 'p'.
    Interest earned = 6p − p = Rs. 5p
    Simple interest = Principal × Rate × Time ÷ 100
    So, 5p = p × R × 50 ÷ 100
    Or, R = (5 × 100) ÷ 50 = 10
    Required value = 2 × 10 + 30 = 20 + 30 = 50

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