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      Question

      A sum of Rs. 9000 amounts to Rs. 10890 at 10% p.a.,

      interest being compounded yearly in a certain time. The simple interest earned (in Rs.) on the same sum for the same time and same rate is:
      A 1800 Correct Answer Incorrect Answer
      B 1890 Correct Answer Incorrect Answer
      C 2000 Correct Answer Incorrect Answer
      D 1700 Correct Answer Incorrect Answer

      Solution

      Let desired time be β€˜t’ years So, 9000(1 + 10/100)t = 10890 Or, (11/10)t = 10890 / 9000 = 121/100 = (11/10)2 Or, t = 2 Desired simple interest = 9000 Γ— 0.10 Γ— 2 = Rs. 1800

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