1) Since an increase of 25% represents an increase of 1/4 of the whole.
2) And we have 4/5, increasing 1/4 we'll write:
[tex]\begin{gathered} \frac{4}{5}+\frac{1}{4}\times\frac{4}{5}= \\ \frac{4}{5}+\frac{1}{5}=\frac{5}{5}=1 \end{gathered}[/tex]
3) So representing in the diagram an increase of 25% would be:
x =4/5
x(1.25) =y
4/5(1.25) =1
