-99.41% is the change from 850 to 5
Calculation steps:
[( 5 - 850 ) ÷ 850] x 100 = -99.41%
Formula
Percentage change = [(5 - 850) / 850] x 100
Subtract the new number by the original number
5 - 850 = -845
-845 ÷ 850 = -0.9941176470588236
-0.9941176470588236 x 100 = -99.41%