[tex]p\%=\dfrac{p}{100}\\\\2\dfrac{1}{2}\%[/tex]
Convert the mixed number to the improper fraction.
[tex]2\dfrac{1}{2}=\dfrac{2\cdot2+1}{2}=\dfrac{5}{2}[/tex]
[tex]2\dfrac{1}{2}\%=\dfrac{5}{2}\%=\dfrac{\frac{5}{2}}{100}=\dfrac{5}{2}\cdot\dfrac{1}{100}=\dfrac{1}{2}\cdot\dfrac{1}{20}=\dfrac{1}{40}[/tex]
