10% of 80 is equal to what percentage of 40?

A 8%
B 5%
C 10%
D 20%

Correct Answer: 20%

ধরি, 80 এর 10% হচ্ছে 40 এর x% এর সমান।<math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo><mn>80</mn><mo>&#xD7;</mo><mfrac><mn>10</mn><mn>100</mn></mfrac><mo> = </mo><mn>40</mn><mo>&#xD7;</mo><mfrac><mi>x</mi><mn>100</mn></mfrac></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x21D2;</mo><mi>x</mi><mo> = </mo><mfrac><mrow><mn>80</mn><mo>&#xD7;</mo><mn>10</mn></mrow><mn>40</mn></mfrac></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x21D2;</mo></math> x = 20
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