-93.13% is the change from 830 to 57
Calculation steps:
[( 57 - 830 ) ÷ 830] x 100 = -93.13%
Formula
Percentage change = [(57 - 830) / 830] x 100
Subtract the new number by the original number
57 - 830 = -773
-773 ÷ 830 = -0.9313253012048193
-0.9313253012048193 x 100 = -93.13%