-32.07% is the change from 820 to 557
Calculation steps:
[( 557 - 820 ) ÷ 820] x 100 = -32.07%
Formula
Percentage change = [(557 - 820) / 820] x 100
Subtract the new number by the original number
557 - 820 = -263
-263 ÷ 820 = -0.3207317073170732
-0.3207317073170732 x 100 = -32.07%