-95.41% is the change from 850 to 39
Calculation steps:
[( 39 - 850 ) ÷ 850] x 100 = -95.41%
Formula
Percentage change = [(39 - 850) / 850] x 100
Subtract the new number by the original number
39 - 850 = -811
-811 ÷ 850 = -0.9541176470588235
-0.9541176470588235 x 100 = -95.41%