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    Question

    Rs. (2x + 400) is invested at a rate of 20% per annum,

    yielding an interest of Rs. 3200 after 4 years. Calculate the interest earned when Rs. (x + 100) is invested under the same conditions.
    A Rs.594 Correct Answer Incorrect Answer
    B Rs.325 Correct Answer Incorrect Answer
    C Rs.720 Correct Answer Incorrect Answer
    D Rs.455 Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Equation for initial investment: Calculate the interest with new principal  The interest earned with the new investment is Rs.720.

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