Express \(0.25\)% as a fraction
\(\dfrac{1}{{400}}\)
\begin{aligned}0.25 \% &=\frac{25}{100} \times \frac{1}{100} \\&=\frac{1}{4} \times \frac{1}{100} \\&=\frac{1}{400}\end{aligned}
Express \(\dfrac{3}{{20}}\) as a percentage
\(15\% \)
\begin{aligned}\frac{3}{20} &=\frac{3}{20} \times 100 \% \\&=15 \%\end{aligned}
Find \(2\frac{1}{2}\% \) of $1200
\(\$ 30\)
\begin{aligned}1200 \times 2.5 \% &=1200 \times 2.5 \times \frac{1}{100} \\&=12 \times 2.5 \\&=\$30\end{aligned}
Express \(28~\text{cm}\) as a percentage of \(4~\text{m}\)
\(7\% \)
\begin{aligned}4 \mathrm{~m}&= 4 \times 100 \mathrm{~cm} \\&=400 \mathrm{~cm} \\\therefore \frac{28}{400}& \times 100 \%=7 \%\end{aligned}
In a particular school of 840 students, 150 are year 12 students. What percentage of the schools population are year 12 students?
\(17.9\% \)
\(\dfrac{150}{840} \times 100 \%=17.9 \%\)
