Question

Barnes and noble bookstore ordered 800 books. On verifying the order only 160 books were actually received. The percent of odering missing?

Answer 1

Namely, if 800 is the 100%, what is 160 in percentage of it?

$\bf \begin{array}{ccllll} amount&\%\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 800&100\\ 160&x \end{array}\implies \cfrac{800}{160}=\cfrac{100}{x}$

solve for "x"