In one year, the population of city increased by 20%. The next year, it decreased by 10%. What was the percentage increase in the population over the two years?
In one year, the population of city increased by 20%. The next year, it decreased by 10%. What was the percentage increase in the population over the two years? Correct Answer 8
শতকরা হার <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfenced><mrow><mi>A</mi><mo> </mo><mo> + </mo><mo> </mo><mi>B</mi><mo> </mo><mo> + </mo><mfrac><mrow><mi>A</mi><mi>B</mi></mrow><mn>100</mn></mfrac></mrow></mfenced></math> = 20% + (– 10)% + <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mn>20</mn><mo>×</mo><mo>(</mo><mo> - </mo><mn>10</mn><mo>)</mo><mo>%</mo></mrow><mn>100</mn></mfrac></math> = 10% – 2% = 8% <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>∴</mo></math>বৃদ্ধির হার ৪%