The best way to do this is to express both percentages as fractions. 30% = 30/100. The word "of" in mathematics means multiplied by, so we can rewrite the question as:
30/100 x 30/100
This comes out at 900/10,000.
This can be simplified to 9/100, which can in turn be converted back into a percentage as 9%
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percentage == 30%% rate:= 30/100 * 100%= 30%
The total after deducting the percentage is $21.00
The total after deducting the percentage is 20.10
The total after deducting the percentage is $696.50
18 out of 30 as a percentage is 60%.