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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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