The number 0.72 can be rewritten in multiple ways depending on the desired format. In fraction form, it can be written as 72/100 or simplified to 18/25 by dividing both the numerator and denominator by 4. In percentage form, it can be expressed as 72%. In scientific notation, it can be written as 7.2 x 10^-1.
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0.1
It's easier if you get rid of the decimals. 72/900 = 0.08
36 percent can be expressed as .36 and 20% as .2. To find 20% of 36%, just multiply the two values: .36 x .2 = .072. 20% of 36% is 7.2%. Thinking of it another way, 20% is 1/5. So you are taking 1/5 of 36%. 36 divided by 5 = 7.2