Percentage

Percentage is used to represent as a fraction of something over 100. (per cent)means per 100 and at the back of every percentage there is always this sign,%.

For example,55% when converted to fraction it would be 55/100 . Since percentage means a fraction of something over 100,just put the percent/100 when converting percentage to fraction. Same goes for decimal. 1.00=100%.When converting percentage to decimal just put the percentage behind "0.".

These are some examples:
I have 100 marbles and you have 200. If you want to express your marbles as a percentage of mine, the formula is
(no. of your marbles/ no. of my marbles) x 100%

but if it is expressing mine as a percentage of yours it will be
(no. of my marbles/no. of your marbles) x 100%

Let’s say that I have 50% of the stocks in this market and it decreased by 20%. The percentage of remaining sticks is not 50%-20%.It is 20/100 X 50%.
It works the same way as fraction. If I have half of the stocks then it decreased by 1/5, it is not ½ -1/5 . If it is decreased by 1/5 it should be left with 4/5 so the answer should be 4/5 x ½.
For percentage, it would be the percentage left/100 x original amount. It is the same for increase.


If there is a sale and it offers 10% discount and another 20% discount for member do not be fooled and sign up as a member. It may seem to you as 10% + 20% and a total of 30% discount but it is wrong. It’s actually 100% - 10% then 20/100 X 90% which is 28% in total not 30%.