What is 12.5% of 72?

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Answer 1 · 2016-11-18T14:02:59

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12.5% of 72 = 9

Note that % is a unit of measurement and it is worth $1/100$

So 12.5% = $12.5/100$

the word 'of' is the same as the mathematical multiply.

Example: $" "2" of "3" " =" " 3+3" " =" "2xx3$
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12.5% of 72 $-> 12.5/100xx72 = 9$

Answer 2 · 2016-11-18T17:06:23

$9$

Fractions, decimals and percents are all different forms of writing the same thing, but they are often used for different purposes.

They are interchangeable.
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$12.5% xx 72$ can be written as $cancel12.5^1/cancel100^8 xx 72$

= $color(red)(1/8) xx 72$

= $9$

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It is useful to know some of the common fractions in the various forms by heart. Here are some to start with ........

$1/2 = 0.5 = 50%" "1/4 = 0.25 = 25%" "3/4 = 0.75 = 75%$

$color(red)(1/8 = 0.125 = 12 1/2%)" "3/8 = 0.325 = 32 1/2%$

$5/8 = 0.625 = 62.5%" "7/8 = 0.875 = 87.5%$

$1/3 = 0.bar3 = 33 1/3%" "2/3 = 0.bar6 = 66 2/3%$