Basic Formula of Percentage
Basic Question
1.What is the formula for calculating percentage?
Solution:
What is the formula for calculating percentage ?
Formula:
Percentage = (Part / Whole) x 100
Example: If a student scores 40 marks out of 50, the percentage is:
(40/ 50) x 100 = 80%
2. How do you find the percentage of a given number?
Solution:
Multiply the given number by the percentage and divide by 100.
Example: Find 25% of 200.
(25 / 100) x 200 = 50
3. If a student's marks increased from 40 to 60, what is the percentage increase?
Solution:
Formula:
Percentage Increase = (New Value - Old Value / Old Value) x 100
New Value = 60
Old Value = 40
(60 - 40 / 40) x 100 = 50%
4. A product's price drops from ₹1,200 to ₹900. What is the percentage decrease?
Solution:
Formula:
Percentage Decrease = (Old Value - New Value / Old Value) x 100
New Value =
Old Value =
(1200 - 900 / 1200) x 100 = 25%
5.If 20% of a number is 50, what is the number?
Solution:
Let the number be A, then:
(20 / 100) x A = 50
A = (50 x 100) / 20 = 250
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