4/5 of 80 is 64.
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5%*80 5/100*80 1/20*80 80/20 4
4 out of 5 is 80%. You can figure this out by taking 4 and dividing it by 5, which is 0.8, which is 80%. Or you can multiply 5 by 20 to get 100 and then multiply 4 by the same number which gives you 80, that would give you 80/100 or 80%.
If 80 = 5% then 80/5 = 1%, which is 16. Then simply multiply by 100 to find 100%, which is 1600. So the answer is that 80 is 5% of 1600.
4/5 = 80%80%
(5+5+5) x5 +5 =80. Cancels to: (15) x5 +5 =80 75 +5 =80 80=80