Question

Please i still dont understand the equation of the increase 80 by 25%

Answer 1

I take it it means "increase 80 by 25% of itself", so

`\begin{array}ll \cline{1-1} \textit{\textit{\LARGE a}\% of \textit{\LARGE b}}\\ \cline{1-1} \\ \left( \cfrac{\textit{\LARGE a}}{100} \right)\cdot \textit{\LARGE b} \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{25\% of 80}}{\left( \cfrac{25}{100} \right)80}\implies 20\hspace{5em}\underset{ increased }{\stackrel{ 80~~ + ~~20 }{\text{\LARGE 100}}}`