In order to convert a percent to a ratio, divide it by 100:
\(\displaystyle{a}\%=\frac{{a}}{{100}}\)

\(\displaystyle{75}\%=\frac{{75}}{{100}}\)

Convert 75% into a decimal and multiply by 30 =(0.75)*30=22.5

\(\displaystyle{75}\%=\frac{{75}}{{100}}\)

Convert 75% into a decimal and multiply by 30 =(0.75)*30=22.5