-20.82% is the change from 850 to 673
Calculation steps:
[( 673 - 850 ) ÷ 850] x 100 = -20.82%
Formula
Percentage change = [(673 - 850) / 850] x 100
Subtract the new number by the original number
673 - 850 = -177
-177 ÷ 850 = -0.20823529411764705
-0.20823529411764705 x 100 = -20.82%