Percentage is a very important section for competitive exams.
Here are some important rules and concepts related to Percentages that you should know:
To express a given number as percent, multiply by 100 and in the same step attach the percentage symbol (%).
To express a given percent into a fraction, divide by 100, and in the same step remove the symbol of the percentage.
X Percent of Y: X% of Y = (X / 100) * Y
X Percent of X: X% of X = 100%
Increase Percentage: Increase % = (Increase / Original) * 100
Decrease Percentage: Decrease % = (Decrease / Original) * 100
Increasing a Number: New number = (1 + X/100) * Original
Decreasing a Number: New number = (1 – X/100) * Original
Comments