PERCENTAGE

Definition :  it is a method of expressing fraction or parts of quantity into an equivalent from.

Percentage are expends interm of hundred’s.

Percentage is denoted by the sign ‘%’.

Formula to calculate percent

If we have to find y% of x,then

 Y% of x = x * y/100

In  The below table important conversion of percentage
 2%= 1/50 3.125%=1/32 4%=1/25 5%=1/20 6.25%=1/16 8%=2/25 8.33%=1/12 10%=1/10 12%=3/25 12.5%=1/8 13.33%=2/15 14.28%=1/7 15%=3/20 16%=4/25 16.66%=1/6 20%=1/5 25%=1/4 33.3%=1/3 37.5%=3/8 40%=2/5 50%=1/2 60%=3/5 62.5%=5/8 66.5%=2/3 75%=3/4 80%=4/5 83.33%=5/6 87.5%=7/8 100%=1 120%=6/5 125%=5/4 133.33%=4/3 150%=2/3 175%=7/4 200%=2
Example:
20% of 300=?

Solution:   according to formula

20% of 300= 300*20/100

3*20 =60

SIMPLE TECHNIQUES OF PROBLEM SOLVING

 TECHNIQUE 1:                       Expressing percent  (X%) into fraction.                           Required fraction  = X/100.

EXAMPLE 1: express 25% in fraction.

SOLUTION : according to the formula,
25%= 25/100
= 1/4.

EXAMPLE 2 : EXPRESS 84% IN FRACTION

SOLUTION: 84%= 84/100

= 21/25.

 TECHNIQUE 2          Expressing a fraction (x/y) in percent.   Required percentage =( x/y*100)%.

Example 1 : convert 3/8 into percentage?

Solution according to the formula, requried percentage = (3/8*100)%
= 37.5%

Example 2 : convert  15/20  into percentage?

Solution:  (15/20*100)%
=75%.

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PERCENTAGE CHAPTER 1 Reviewed by SSC IBPS on 14:10:00 Rating: 5