-80.81% is the change from 422 to 81
Calculation steps:
[( 81 - 422 ) ÷ 422] x 100 = -80.81%
Formula
Percentage change = [(81 - 422) / 422] x 100
Subtract the new number by the original number
81 - 422 = -341
-341 ÷ 422 = -0.8080568720379147
-0.8080568720379147 x 100 = -80.81%