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A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is :________?

Correct answer: D. Rs. 698

  • A. Rs. 700
  • B. Rs. 690
  • C. Rs. 650
  • D. Rs. 698

Explanation

The increase from 3 years to 4 years is Rs. 854 - Rs. 815 = Rs. 39, so the simple interest for 1 year is Rs. 39. Therefore, the principal is Rs. 815 - (Rs. 39 x 3 years) = Rs. 698. The likely trap is Rs. 700, caused by rounding the calculated principal instead of retaining the exact amount.

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