What will be the profit or loss if 4 mangoes are sold at the same price which 5 were bought?

What will be the profit or loss if 4 mangoes are sold at the same price which 5 were bought? Correct Answer 25%

এ ধরনের math, যেখানে বিক্রয়ের unit ক্রয়ের unit থেকে 1 কম, সেক্ষেত্রে সবসময় লাভ হবে, এবং লাভের % = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>100</mn><mrow><mi>&#x9AC;</mi><mi>&#x9BF;</mi><mi>&#x995;</mi><mi>&#x9CD;</mi><mi>&#x9B0;</mi><mi>&#x9DF;</mi><mi>&#x9C7;</mi><mi>&#x9B0;</mi><mo>&#xA0;</mo><mi>u</mi><mi>n</mi><mi>i</mi><mi>t</mi></mrow></mfrac><mfrac><mn>100</mn><mn>4</mn></mfrac></math> = 25%পূর্ণ নিয়ম:Let, the cost price of 5 mangoes is x <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo><mo>&#xA0;</mo><mn>1</mn><mo>&#xA0;</mo><mfrac><mi>x</mi><mn>5</mn></mfrac></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo><mo>&#xA0;</mo><mn>4</mn><mo>&#xA0;</mo><mo>&#xA0;</mo><mfrac><mrow><mn>4</mn><mi>x</mi></mrow><mn>5</mn></mfrac></math>Now, selling price of 4 mangoes is x<math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo></math> Profit <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mi>x</mi><mo> - </mo><mstyle displaystyle = "true"><mfrac><mrow><mn>4</mn><mi>x</mi></mrow><mn>5</mn></mfrac></mstyle></mrow><mstyle displaystyle = "true"><mfrac><mrow><mn>4</mn><mi>x</mi></mrow><mn>5</mn></mfrac></mstyle></mfrac><mo>&#xD7;</mo><mn>100</mn><mo>%</mo><mspace linebreak = "newline"/><mo> = </mo><mfrac><mstyle displaystyle = "true"><mfrac><mrow><mn>5</mn><mi>x</mi><mo> - </mo><mn>4</mn><mi>x</mi></mrow><mn>5</mn></mfrac></mstyle><mstyle displaystyle = "true"><mfrac><mrow><mn>4</mn><mi>x</mi></mrow><mn>5</mn></mfrac></mstyle></mfrac><mo>&#xD7;</mo><mn>100</mn><mo>%</mo><mspace linebreak = "newline"/><mo> = </mo><mfrac><mi>x</mi><mn>5</mn></mfrac><mo>&#xD7;</mo><mfrac><mn>5</mn><mrow><mn>4</mn><mi>x</mi></mrow></mfrac><mo>&#xD7;</mo><mn>100</mn><mo>%</mo><mspace linebreak = "newline"/><mo> = </mo><mfrac><mn>1</mn><mn>4</mn></mfrac><mo>&#xD7;</mo><mn>100</mn><mo>%</mo><mspace linebreak = "newline"/></math> = 25%
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