125% is the change from 80 to 180
Calculation steps:
[( 180 - 80 ) ÷ 80] x 100 = 125%
Formula
Percentage change = [(180 - 80) / 80] x 100
Subtract the new number by the original number
180 - 80 = 100
100 ÷ 80 = 1.25
1.25 x 100 = 125%
Example