It'll help you to know that 20% is the same amount as 0.2, and that
the word "of" in word-problems almost always means "times".
Knowing both of those facts, you can re-write the question: 0.2 x 80,
and then it's easy to do the arithmetic, and find that it's 16 .
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25 * .80 = 20
20 percent of 80 percent = 0.16 or 16%
80% of 20 is 16.
ratio = 80% : 20% or 80 : 20 ot 8 : 2 or 4 : 1
80% of 20 = 80% * 20 = 0.8 * 20 = 16