-55.56% is the change from 180 to 80
Calculation steps:
[( 80 - 180 ) ÷ 180] x 100 = -55.56%
Formula
Percentage change = [(80 - 180) / 180] x 100
Subtract the new number by the original number
80 - 180 = -100
-100 ÷ 180 = -0.5555555555555556
-0.5555555555555556 x 100 = -55.56%