10% =1.8
so..
20% = 1.8 x 2
= 3.6
--or--
20% * 80
20/100 * 80
1/5 * 80
(1*80)/5
80/5
16
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18% of 20, written as a percent, is 18% of 20. Written as an actual number, it is 3.6
20*.90 = 18
18 out of 20 as a percentage is 90%
90%
18