What is 12.5% of 72?

2 Answers
Nov 18, 2016

Answer:

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12.5% of 72 = 9

Explanation:

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#

Nov 18, 2016

Answer:

#9#

Explanation:

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%#