Question

20 percent out of 80 is what out of a 100

Answer 1

let's say 80 is the 100%, what is the quantity 20 out of 80 in percent? well \(\large \begin{array}{ccllll}
quantity&percentage\\
\hline\\
80&100\\
20&x
\end{array}\implies \cfrac{80}{20}=\cfrac{100}{x}\)

once you get "x", then do the same to find what is "x % of 100"

Answer 2

The way you stated your problem, this is how you do it.

20% of 80 =
= 20/100 * 80
= 0.2 * 80
= 16

16 out of 100 is 16% since % means out of 100.

Perhaps, you didn't mean it the way you stated it.