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30% of 100 = 100*30/100 = 30
percentage == 30%% rate:= 30/100 * 100%= 30%
"Percent" = "of 100". So 30 is 30% of 100.
30/100= 30 ÷ 100= 0.30 in decimal
Example: 30% off of $100 = 30% discount applied to $100 = $100 - (30% * $100) = $100 - (0.30 * $100) = $100 - $30 = $70