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      Question

      Rs. (4x + 200) is invested at a simple interest rate of

      18% per annum, earning an interest of Rs. 2160 after 4 years. Calculate the interest earned when Rs. (5x - 100) is invested at the same rate for the same period.
      A Rs.2400 Correct Answer Incorrect Answer
      B Rs.2448 Correct Answer Incorrect Answer
      C Rs.3528 Correct Answer Incorrect Answer
      D Rs.3128 Correct Answer Incorrect Answer
      E none of these Correct Answer Incorrect Answer

      Solution

      Given Data: Principal = 4x+200 Interest earned = Rs. 2160 Rate = 18% per annum Time = 4 years Calculate 'x' by Using the simple interest formula: Simplify to find x=700. New Principal: Substitute x=700 into 5x−100: 5(700)−100=3400 Calculate New Interest: Use the simple interest formula again The interest earned on Rs. 3400 is Rs. 2448.

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