-37.53% is the change from 850 to 531
Calculation steps:
[( 531 - 850 ) ÷ 850] x 100 = -37.53%
Formula
Percentage change = [(531 - 850) / 850] x 100
Subtract the new number by the original number
531 - 850 = -319
-319 ÷ 850 = -0.37529411764705883
-0.37529411764705883 x 100 = -37.53%