Question

find last year's salary if, after a 5% pay raise, this year's salary is $47,250

Answer 1

so $47,250 is really the original amount PLUS 5% of the original amount added to
so one can say that the original amount was the 100%

and $47,250 is really 100% + 5%, so the 105% of the original amount, thus one could say that \(\begin{array}{ccllll}
quantity&percentage\\
\hline\\
x&100\\
47,250&105
\end{array}\implies \bf \cfrac{x}{47,250}=\cfrac{100}{105}\)