Question
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Answer (Detailed Solution Below)
Option 2 : 36% / 36%
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Detailed Solution
सही उत्तर 36% / 36% है।
Key Points
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prepsnap.in • Part -AQuestion:
The radius of a circle is decreased by 20%. By what percent does its area decrease? / एक वृत्त की त्रिज्या 20% घटा दी जाती है। उसके क्षेत्रफल में कितने प्रतिशत की कमी होती है?
1.
40% / 40%
2.
36% / 36%
3.
20% / 20%
4.
44% / 44%
Correct Answer: 36% / 36%
New area = $(0.80)^2 = 0.64$ times the original, so the decrease is $36\%$. The trap is answering 40% (double the 20%). / नया क्षेत्रफल $0.64$ गुना; कमी $36\%$।
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