Question

A salesperson sells $2100 in merchandise and earns a commission of $273, What is the commission rate?

Answer 1

if we take 2100 to be the 100%, what is 273 off of it in percentage?

$\begin{array}{ccll} amount&\%\\ \cline{1-2} 2100 & 100\\ 273& x \end{array} \implies \cfrac{2100}{273}=\cfrac{100}{x}\implies \cfrac{100}{13}=\cfrac{100}{x} \\\\\\ 100x=1300\implies x=\cfrac{1300}{100}\implies x=13$