3. What is the difference between $25 \%$ of $£ 37$ and $25 \%$ of $£ 17$ ?
A $£ 4.25$
B $£ 5$
C £6
D $£ 7.50$
E $£ 9.25$
3. B The required difference is $25 \%$ of $(£ 37-£ 17)=25 \%$ of $£ 20$. Hence the difference between $25 \%$ of $£ 37$ and $25 \%$ of $£ 17$ is $£ 5$.