-47.59% is the change from 830 to 435
Calculation steps:
[( 435 - 830 ) ÷ 830] x 100 = -47.59%
Formula
Percentage change = [(435 - 830) / 830] x 100
Subtract the new number by the original number
435 - 830 = -395
-395 ÷ 830 = -0.4759036144578313
-0.4759036144578313 x 100 = -47.59%