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UPSC Civil ServicesPrelims2025General Studies Paper II (CSAT)
Question
QQ10. The price (p) of a commodity is first increased by k%; then decreased by k%; again increased by k%; and again decreased by k%. If the new price is q, then what is the relation between p and q ?
Options
- A p(10^4 - k^2)^2 = q × 10^8
- B p(10^4 - k^2)^2 = q × 10^4
- C p(10^4 - k^2) = q × 10^4
- D p(10^4 - k^2) = q × 10^8
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Correct Answer
A p(10^4 - k^2)^2 = q × 10^8
Model Answer
Answer: option A, as per UPSC's final answer key (Series A).