Simple Interest – Feasibility check repeated at 8% for 6 years: The simple interest on a sum at 8% per annum for 6 years is claimed to be half the principal. Determine the sum or conclude feasibility.

Difficulty: Easy

Correct Answer: Data is inadequate

Explanation:


Introduction / Context:
We test whether the given interest statement is compatible with simple-interest proportionality. If the computed interest fraction differs from the claim, no principal can satisfy the condition, and we cannot determine a unique sum.



Given Data / Assumptions:

  • Rate r = 8% per annum
  • Time t = 6 years
  • Claim: simple interest equals half of the principal


Concept / Approach:
Use I = P * r * t / 100 and compare I / P to 1/2. The fraction depends only on r and t for simple interest, not on P.



Step-by-Step Solution:
I / P = (r * t) / 100 = (8 * 6) / 100 = 48 / 100 = 0.48The claim requires 0.50. Since 0.48 ≠ 0.50, the condition cannot be met by any principal.



Verification / Alternative check:
Try P = ₹ 6,000: I = 6,000 * 8 * 6 / 100 = ₹ 2,880 (48% of P), not half. The contradiction persists for all P values.



Why Other Options Are Wrong:
Numerical principal choices cannot resolve a percentage contradiction. “Not possible” is a reasonable description; within the provided set, the intended answer is “Data is inadequate” (no sum can be uniquely determined).



Common Pitfalls:
Confusing “half the amount” with “half the principal,” or overlooking that simple interest scales linearly with P, r, and t, not with arbitrary claims.



Final Answer:
Data is inadequate

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