-37.65% is the change from 850 to 530
Calculation steps:
[( 530 - 850 ) ÷ 850] x 100 = -37.65%
Formula
Percentage change = [(530 - 850) / 850] x 100
Subtract the new number by the original number
530 - 850 = -320
-320 ÷ 850 = -0.3764705882352941
-0.3764705882352941 x 100 = -37.65%