-81.57% is the change from 662 to 122
Calculation steps:
[( 122 - 662 ) ÷ 662] x 100 = -81.57%
Formula
Percentage change = [(122 - 662) / 662] x 100
Subtract the new number by the original number
122 - 662 = -540
-540 ÷ 662 = -0.8157099697885196
-0.8157099697885196 x 100 = -81.57%