Respuesta :

1%=1/100

22,5% =22,5/100 = 225/1000 = 9/40
[tex]p\%=\dfrac{p}{100}\\\\22.5\%=\dfrac{22.5}{100}=\dfrac{22.5\cdot10}{100\cdot10}=\dfrac{225}{1000}=\dfrac{225:25}{1000:25}=\boxed{\frac{9}{40}}[/tex]