Increase percentage = ((New value – Original value) / Original value) × 100
Decrease percentage = ((Original value – New value) / Original value) × 100
Percentage change = ((New value – Original value) / Original value) × 100
If the result is positive, it is an increase
If the result is negative, it is a decrease
Original value = starting value
New value = final value
Example increase: ((120 – 100) / 100) × 100 = 20%
Example decrease: ((100 – 80) / 100) × 100 = 20%