Percentage ( Expressing One Quantity as a Percentage of Another Quantity)

Percentage ( Expressing One Quantity as a Percentage of Another Quantity)

Example 1 
What per cent is number 3 of number 20 ?

Solution:

As per cent means out of 100. Then by unitary method

out of 20 ----> 3

out of 1 -----> 3/20

out of 100 ----> 3/20 x 100 = 15%

Hence to find what percent the first number is of 2nd number, we divide the first method by the second number and multiply the result by 100.

Example 2:
 Ravi obtained 325 marks out of a maximum of 400 marks. Find the percentage of marks obtained by him.

Solution: 

required percentage of marks = 325/400 x 100 = 81.25%

Example 3:
In a factory of 150 workers, 18 were absent in a day what percentage were present?

Solution:

Present = 150-18 = 132

Percentage presence = 132/150 x100 = 88%

Example 4
Kurla obtained 480 marks out of 600 and birla obtained 560 marks out of 800. Whose performance is better.

Solution:

% marks of kurla = 480/600 x 100 = 80%

%marks of birla = 560/800 x 100 = 70%

so, obviously krula's performance is better than that of birla even though getting less absolute marks.