Question

A shirt that costs $20 is on sale for 20% off. What is the discounted price of the shirt?​

Answer 1

To do this you would do

$20 times (20/100) to get $20*(.20) = $4 which is the discounted price.

%(Percent) means "a specified amount in or for every hundred." In this case 20 for every 100.

Answer 2

well, 100% - 20% = 80%, so the discounted price is really 80% of the original 20 bucks, what's 80% of 20?

`\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{80\% of 20}}{\left( \cfrac{80}{100} \right)20}\implies \text{\LARGE 16}`