-81.18% is the change from 850 to 160
Calculation steps:
[( 160 - 850 ) ÷ 850] x 100 = -81.18%
Formula
Percentage change = [(160 - 850) / 850] x 100
Subtract the new number by the original number
160 - 850 = -690
-690 ÷ 850 = -0.8117647058823529
-0.8117647058823529 x 100 = -81.18%