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)
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.
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
6.40 because if you can find 25 percent and 5 percent you can take 5 percent from 25 percent for 20 percent.
1%
100% is represented by percent.
If 23 boxes represent 10% of the troop's sales, then we can divide 23 by 0.10 to find the total sales of the troop. The troop sold 230 boxes of Girl scout cookies.
Eleven cookies were sold .
0.6 represented as a percent is 60%
95%
88 percent of geologic time is represented by the Precambrian time span.
0.25
0.5
37.5%
10 percent more than 3.50 is 3.85 .
27.2 pph = 27.2%
.65 may be represented as 65% == 65%