-83.88% is the change from 850 to 137
Calculation steps:
[( 137 - 850 ) ÷ 850] x 100 = -83.88%
Formula
Percentage change = [(137 - 850) / 850] x 100
Subtract the new number by the original number
137 - 850 = -713
-713 ÷ 850 = -0.8388235294117647
-0.8388235294117647 x 100 = -83.88%