-99.29% is the change from 850 to 6
Calculation steps:
[( 6 - 850 ) ÷ 850] x 100 = -99.29%
Formula
Percentage change = [(6 - 850) / 850] x 100
Subtract the new number by the original number
6 - 850 = -844
-844 ÷ 850 = -0.9929411764705882
-0.9929411764705882 x 100 = -99.29%