a)
\frac{3}{5}=\frac{3*20}{5*20}=\frac{60}{100}=60\%
\frac{12}{200}=\frac{12:2}{200:2}=\frac{6}{100}=6\%
\frac{4}{25}=\frac{4*4}{25*4}=\frac{16}{100}=16\%
b)
\frac{3}{4}=\frac{3*25}{4*25}=\frac{75}{100}=75\%
\frac{9}{25}=\frac{9*4}{25*4}=\frac{36}{100}=36\%
\frac{9}{10}=\frac{9*10}{10*10}=\frac{90}{100}=90\%
c)
1\frac{9}{300}=1\frac{3}{100}=\frac{103}{100}=103\%
2\frac{25}{100}=\frac{225}{100}=225\%
3\frac{1}{50}=\frac{151}{50}=\frac{151*2}{50*2}=\frac{302}{100}=302\%