-33.81% is the change from 831 to 550
Calculation steps:
[( 550 - 831 ) ÷ 831] x 100 = -33.81%
Formula
Percentage change = [(550 - 831) / 831] x 100
Subtract the new number by the original number
550 - 831 = -281
-281 ÷ 831 = -0.3381468110709988
-0.3381468110709988 x 100 = -33.81%