-93.06% is the change from 821 to 57
Calculation steps:
[( 57 - 821 ) ÷ 821] x 100 = -93.06%
Formula
Percentage change = [(57 - 821) / 821] x 100
Subtract the new number by the original number
57 - 821 = -764
-764 ÷ 821 = -0.9305724725943971
-0.9305724725943971 x 100 = -93.06%