-32.97% is the change from 831 to 557
Calculation steps:
[( 557 - 831 ) ÷ 831] x 100 = -32.97%
Formula
Percentage change = [(557 - 831) / 831] x 100
Subtract the new number by the original number
557 - 831 = -274
-274 ÷ 831 = -0.3297232250300842
-0.3297232250300842 x 100 = -32.97%