-33.01% is the change from 821 to 550
Calculation steps:
[( 550 - 821 ) ÷ 821] x 100 = -33.01%
Formula
Percentage change = [(550 - 821) / 821] x 100
Subtract the new number by the original number
550 - 821 = -271
-271 ÷ 821 = -0.33008526187576126
-0.33008526187576126 x 100 = -33.01%