-24.69% is the change from 81 to 61
Calculation steps:
[( 61 - 81 ) ÷ 81] x 100 = -24.69%
Formula
Percentage change = [(61 - 81) / 81] x 100
Subtract the new number by the original number
61 - 81 = -20
-20 ÷ 81 = -0.24691358024691357
-0.24691358024691357 x 100 = -24.69%