-30.34% is the change from 557 to 388
Calculation steps:
[( 388 - 557 ) ÷ 557] x 100 = -30.34%
Formula
Percentage change = [(388 - 557) / 557] x 100
Subtract the new number by the original number
388 - 557 = -169
-169 ÷ 557 = -0.30341113105924594
-0.30341113105924594 x 100 = -30.34%