Percentage problems are generally asked in all major exams like SSC, IBPS,CAT, GATE etc.These problems become complex if we do not have basic concept of problems.We will deal with concept of percentage problems and formulas are given at the end of this chapter to help students revise important formulas and concepts.
Concept Of Percentage
By certain percentage we mean many hundredths.It means X % means X hundredths.
There are two things which should be clear to us.
- 1.Conversion into percentage
- In order to convert some quantity(say X) into percentage.We simply multiply that quantity with 100.
Convert 5/2 into percentage.
We simply multiply it with 100=(5/20)*100=250%
- 2.Conversion into Fraction from given percentage
- If we have given X %.In order to change it into fraction we simply divide it with hundred i.e X/100.
Convert 20% into fraction
20/100 = 1/5
In percentage, a term ‘OF’ is used.Like, 20% “OF” all students play cricket and rest play football. If there are 50 students in the class, 20% “OF” 50 students play cricket.
It means (20/100) * 50 =10 students play cricket.Replace “of” with a multiplication sign.
|Percentage Important Formulas|