20/80 x 100 = 25%
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20% 52/65 = 80% 100%-80% =20%
20 percent of 80 percent = 0.16 or 16%
72/80 x 100 = 90 % 100 - 90 = 10 % which is the decrease from 80 to 72
80% of 20 is 16.
ratio = 80% : 20% or 80 : 20 ot 8 : 2 or 4 : 1