-42.55% is the change from 557 to 320
Calculation steps:
[( 320 - 557 ) ÷ 557] x 100 = -42.55%
Formula
Percentage change = [(320 - 557) / 557] x 100
Subtract the new number by the original number
320 - 557 = -237
-237 ÷ 557 = -0.4254937163375224
-0.4254937163375224 x 100 = -42.55%