You have to write an equation for this. When you do percents, you always have to convert them to decimals. (Therefore, 80% is .80 as a decimal)
.80x = 8
Divide both sides of the equation by .8 and you'll get
x = 10
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If 80 percent of a number is 8, then to discover what the number 8 is 80 percent of, divide the number by 0.8. In this instance, 8 / 0.8 = 10.
1.00/.8 = 1.25 1.25 x the known number is your answer
24 percent of 80 = 19.2= 24% * 80= 0.24 * 80= 19.2
80%
.8