-55.25% is the change from 181 to 81
Calculation steps:
[( 81 - 181 ) ÷ 181] x 100 = -55.25%
Formula
Percentage change = [(81 - 181) / 181] x 100
Subtract the new number by the original number
81 - 181 = -100
-100 ÷ 181 = -0.5524861878453039
-0.5524861878453039 x 100 = -55.25%