Percentage change tells you how much a value has increased or decreased compared with its original value.
Formula
Example: Calculate the percentage increase if the price of the cooking oil of $15 increased to ₨ $18.
Solution:
Given,
- Original price of the oil = 15
- New price of the oil = 18
Change in the value of price = 18 - 15 = 3
Percentage increase = [(change in value)/original value] × 100
Percentage increase = (3/15) × 100 = 20 %Hence, the percentage increase in the price of the cooking oil is 20%
Increase in Percentage
It is calculated by subtracting the original value from the new value, dividing it by the original value, and then multiplying the resultant with 100. The formula for the percentage increase is given as,
Percentage Increase = [(New value - Original value)/Original value] × 100
Note: If a value is increased by x%, then the new value is (100 + x)% of the original amount.
Decrease in Percentage
It is calculated by subtracting the new value from the original value, dividing it by the original value, and then multiplying the resultant by 100. The formula for the percentage decrease is given as,
Percentage Decrease = [(Original value - New value)/Original value] × 100
 Note: If a value is decreased by x%, then the new value is (100 - x)% of the original amount.
