-51.69% is the change from 830 to 401
Calculation steps:
[( 401 - 830 ) ÷ 830] x 100 = -51.69%
Formula
Percentage change = [(401 - 830) / 830] x 100
Subtract the new number by the original number
401 - 830 = -429
-429 ÷ 830 = -0.516867469879518
-0.516867469879518 x 100 = -51.69%