-52.24% is the change from 850 to 406
Calculation steps:
[( 406 - 850 ) ÷ 850] x 100 = -52.24%
Formula
Percentage change = [(406 - 850) / 850] x 100
Subtract the new number by the original number
406 - 850 = -444
-444 ÷ 850 = -0.5223529411764706
-0.5223529411764706 x 100 = -52.24%