yesterday's price was "x", and that was the 100% of it, now, we know 657 is the 100% - 27%, the discounted price, so 657 is really the 73% then, so, if 657 is the 73%, what is "x", the 100%?
[tex]\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
x&100\\
657&73
\end{array}\implies \cfrac{x}{657}=\cfrac{100}{73}\implies x=\cfrac{657\cdot 100}{73}[/tex]
but is today only, so, try to get there before the store closes, also make sure you get some air deodorizer too.
