-87.18% is the change from 850 to 109
Calculation steps:
[( 109 - 850 ) ÷ 850] x 100 = -87.18%
Formula
Percentage change = [(109 - 850) / 850] x 100
Subtract the new number by the original number
109 - 850 = -741
-741 ÷ 850 = -0.8717647058823529
-0.8717647058823529 x 100 = -87.18%