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      Question

      The compound interest (compounded

      annually) on a certain amount for 2 years is Rs. 2415. If the annual rate of interest is 10%, what is the principal amount?
      A Rs.12500 Correct Answer Incorrect Answer
      B Rs.11500 Correct Answer Incorrect Answer
      C Rs.10500 Correct Answer Incorrect Answer
      D Rs.12000 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the sum be Rs. 'a'. Compound interest = a Γ— [1+(10/100)2-1] = 2415 Or, a Γ—(121/100 - 1) = 2415 Or, 'a' = 2415 Γ— (100/21) So, 'a' = 11500 So, required sum = Rs.11500

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