-30.96% is the change from 830 to 573
Calculation steps:
[( 573 - 830 ) ÷ 830] x 100 = -30.96%
Formula
Percentage change = [(573 - 830) / 830] x 100
Subtract the new number by the original number
573 - 830 = -257
-257 ÷ 830 = -0.3096385542168675
-0.3096385542168675 x 100 = -30.96%