-98.82% is the change from 850 to 10
Calculation steps:
[( 10 - 850 ) ÷ 850] x 100 = -98.82%
Formula
Percentage change = [(10 - 850) / 850] x 100
Subtract the new number by the original number
10 - 850 = -840
-840 ÷ 850 = -0.9882352941176471
-0.9882352941176471 x 100 = -98.82%