Answer:
[tex]\large\boxed{18\%}[/tex]
Step-by-step explanation:
[tex]\$21.73-\text{selling price}\\\\\$26.50-\text{starting price}\\\\\$26.50-\$21.73=\$4.77-\text{difference of price - discount}\\\\METHOD\ 1:\\\\\dfrac{4.77}{26.50}=0.18=0.18\cdot100\%=\boxed{18\%}\\\\METHOD\ 2:\\\\\begin{array}{ccc}\$26.50&-&100\%\\\\\$4.77&-&p\%\end{array}\qquad\text{cross multiply}\\\\\\26.50p=(4.77)(100)\\\\26.50p=477\qquad\text{divide both sides by 26.50}\\\\\boxed{p=18\ (\%)}[/tex]
