-93.21% is the change from 839 to 57
Calculation steps:
[( 57 - 839 ) ÷ 839] x 100 = -93.21%
Formula
Percentage change = [(57 - 839) / 839] x 100
Subtract the new number by the original number
57 - 839 = -782
-782 ÷ 839 = -0.932061978545888
-0.932061978545888 x 100 = -93.21%