+6251 there are two ways to do this
20% of 2400 is
\(r=\dfrac{20}{100} 2400 = \dfrac{2400}{5}=480\)
we are taking this off of 2400 so
\(remaining = 2400-r = 2400-480 = 1920\)
or we could do it by noting that if we remove 20% we are leaving (100-20)=80%
\(remaining = 2400 \dfrac {100-20}{100}=2400 \dfrac{80}{100}=24\times 80=1920\)
