-88.39% is the change from 491 to 57
Calculation steps:
[( 57 - 491 ) ÷ 491] x 100 = -88.39%
Formula
Percentage change = [(57 - 491) / 491] x 100
Subtract the new number by the original number
57 - 491 = -434
-434 ÷ 491 = -0.8839103869653768
-0.8839103869653768 x 100 = -88.39%