Here is a trick for figuring out perctages. Put your figures like this:
mulitply 18 x 100 = 1800 then divide that by 5 then you will have the number of boxes the troop sold. 56 (I did that in my head so check on the calculator)
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Oh, dude, like, 90 percent of 450,000 is, like, 405,000. So, if you had 450,000 cookies and I took 90 percent of them, you'd be left with 45,000 cookies. But, like, who needs that many cookies anyway, am I right?
Percent means "per hundred" or divided by one hundred. 32% can be represented as 32/100. 32/100 can be simplified to 16/50 or 8/25.
A percent can be represented as a fraction of x/100, and so is not irrational, unless the numerator of the fraction (the # before the %) is itself irrational. For example: 2% is not irrational. 55.443% is not irrational. sqrt(5)% is irrational.
To convert a fraction to a percentage, you can multiply the fraction by 100. In this case, one twelfth can be represented as 1/12. Multiplying 1/12 by 100 gives you 8.33%. Therefore, one twelfth is equivalent to 8.33%.
Percent is a relative expression, meaning it has to be 8 percent of something. If you wanted to add 8 percent of a number to itself, e.g. something is $49.99 and you want to know how much 8 percent tax will bring your total to, you multiply the number by .08 (which is how 8 percent is represented as a decimal) and then add the result to the original number. So: 49.99 X .08 =3.99 so after tax you would pay roughly $53.99 hope this helps! If you have a calculator handy, then to add 8 percent to a quantity, say £675, just multiply the £675 by 1.08 and you will have the answer. This works because the original amount is 100% of itself, and adding on the extra 8% creates 108%, which means 108 hundredths, which as a decimal is 1.08 Similarly to find the amount when 17.5% is added, just multiply the original amount by 1.175