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A sum amount to Rs.1344 in two years at simple interest. What will be the compound interest on the same sum at the same rate of interest for the same period?

Correct answer: D. Data insufficient for the answer

  • A. Rs.150
  • B. Rs.140
  • C. Rs.130
  • D. Data insufficient for the answer

Explanation

The simple-interest amount gives P(1 + 2r) = Rs.1344, but both the principal P and rate r are unknown. Compound interest would be P(2r + r²), so the available information cannot determine one unique value. Students may choose Rs.140 by assuming an unstated principal or rate.

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Percentages express a quantity as parts per hundred and support calculations involving increases, decreases, discounts, commissions, taxes, and successive changes. Questions require distinguishing percentage change from percentage points and identifying the original value when a final value and its percentage change are given.

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