-86% is the change from 557 to 78
Calculation steps:
[( 78 - 557 ) ÷ 557] x 100 = -86%
Formula
Percentage change = [(78 - 557) / 557] x 100
Subtract the new number by the original number
78 - 557 = -479
-479 ÷ 557 = -0.8599640933572711
-0.8599640933572711 x 100 = -86%