Question

A salesperson sells $2,100 in merchandise and earns a commission of $273 . what is the commission rate

Answer 1

well, if we take $2100 to be the 100%, what's $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}\implies 13=x`