-97.29% is the change from 850 to 23
Calculation steps:
[( 23 - 850 ) ÷ 850] x 100 = -97.29%
Formula
Percentage change = [(23 - 850) / 850] x 100
Subtract the new number by the original number
23 - 850 = -827
-827 ÷ 850 = -0.9729411764705882
-0.9729411764705882 x 100 = -97.29%