-83.18% is the change from 850 to 143
Calculation steps:
[( 143 - 850 ) ÷ 850] x 100 = -83.18%
Formula
Percentage change = [(143 - 850) / 850] x 100
Subtract the new number by the original number
143 - 850 = -707
-707 ÷ 850 = -0.831764705882353
-0.831764705882353 x 100 = -83.18%