-32.89% is the change from 830 to 557
Calculation steps:
[( 557 - 830 ) ÷ 830] x 100 = -32.89%
Formula
Percentage change = [(557 - 830) / 830] x 100
Subtract the new number by the original number
557 - 830 = -273
-273 ÷ 830 = -0.3289156626506024
-0.3289156626506024 x 100 = -32.89%