-86.46% is the change from 421 to 57
Calculation steps:
[( 57 - 421 ) ÷ 421] x 100 = -86.46%
Formula
Percentage change = [(57 - 421) / 421] x 100
Subtract the new number by the original number
57 - 421 = -364
-364 ÷ 421 = -0.8646080760095012
-0.8646080760095012 x 100 = -86.46%