Explicação passo-a-passo:

1/5=20/100=0,20=20%

12/25=48/100=0,48=48%

4/5=80/100=0,80=80%

8/25=32/100=0,32=32%

1/100=1/100=0,01=1%

1/4=25/100=0,25=25%