-80.57% is the change from 422 to 82
Calculation steps:
[( 82 - 422 ) ÷ 422] x 100 = -80.57%
Formula
Percentage change = [(82 - 422) / 422] x 100
Subtract the new number by the original number
82 - 422 = -340
-340 ÷ 422 = -0.8056872037914692
-0.8056872037914692 x 100 = -80.57%