-93.21% is the change from 840 to 57
Calculation steps:
[( 57 - 840 ) ÷ 840] x 100 = -93.21%
Formula
Percentage change = [(57 - 840) / 840] x 100
Subtract the new number by the original number
57 - 840 = -783
-783 ÷ 840 = -0.9321428571428572
-0.9321428571428572 x 100 = -93.21%