Find the difference between the new value and the original value
Divide the difference by the original value
Multiply the result by 100
If the result is positive, it is a percentage increase
If the result is negative, it is a percentage decrease
Formula: Percentage change = ((New value – Original value) ÷ Original value) × 100
For increase: ((New value – Original value) ÷ Original value) × 100
For decrease: ((Original value – New value) ÷ Original value) × 100