Question

Price:$20 coupon:85% off find the savings

Answer 1

`\bf \begin{array}ll \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{85\% of 20}}{\left( \cfrac{85}{100} \right)20}\implies 17`