Answer :

konrad509
[tex]28\%\cdot80=0.28\cdot80=22.4\Rightarrow A[/tex]
ValyRemus
p%=[tex] \frac{p}{100} [/tex]

[tex] \frac{28}{100}= \frac{28\div4}{100\div4}= \frac{7}{25} [/tex]

[tex] \frac{7}{25}*80= \frac{560}{25} = \boxed {22,4} [/tex]