a mathematical question. how do easaly work out perecentages?

Answer 1

well to put a percentage as a fraction take the percentage number (like 85) over 100

85/100 = 85%
to convert into a decimal

move two decimal places
.85=85%

these are two key words when finding percentages of means multiply is means divide

so if you have $45 dollars is 20% of the cost you take 45/.20

225

20% of 225 is .2*225

=.45

check ya later ♥

Answer 2

To work out pecentages see if the percent can be reduced to a smaller fraction.

e.g. 40% of 20 = 20 * 40/100
= 20 * 2/5 (reducing 40 & 100)
= 4 * 2 (cancel 20 & 5)
= 8
With practice it is easy.
Or also we can try to keep the denominator 100 and multiply the numerators.

8% of 40 = 40 * 8 / 100
= 320 / 100
= 3.2

You only have to decide which one to use where.

Answer 3

I don't really understand what you want to find out, but i'll try some hints:
1.you want to know p from "A is p percents from B":
p=100*A/B
example: A=3, B=6, p=50%
2.you want to know p from "A is p percent less than B":
p=(1-A/B)*100
example A=9, B=10, p=10%
3.you want to know what will be A after adding p percents:
A*(1+p/100)
example: 20 will become 21=20*1.05, if p is 5%

Answer 4

A percentage is a fraction with 100 as denominator.
23% means 23/100.
45% means 45/100.
Percentage expresses one quantity based on a reference quantity.
To calculate percentage, first you need to identify the quantity in question for percentage calculation and the reference quantity.
Other operations are similar to fractions and decimals.
'Of" operation is nothing but multiplication.
15% of 200 means 15/100 * 200=30.
Hope you understood.

Answer 5

10 per cent of 100 is 10p go from there