-31.29% is the change from 850 to 584
Calculation steps:
[( 584 - 850 ) ÷ 850] x 100 = -31.29%
Formula
Percentage change = [(584 - 850) / 850] x 100
Subtract the new number by the original number
584 - 850 = -266
-266 ÷ 850 = -0.3129411764705882
-0.3129411764705882 x 100 = -31.29%