-48.07% is the change from 830 to 431
Calculation steps:
[( 431 - 830 ) ÷ 830] x 100 = -48.07%
Formula
Percentage change = [(431 - 830) / 830] x 100
Subtract the new number by the original number
431 - 830 = -399
-399 ÷ 830 = -0.4807228915662651
-0.4807228915662651 x 100 = -48.07%